Co-op

This article is about co-op babies. For the monster, see Baby. For items that follow Isaac, see familiar.

Rebirth features 2 player local co-op on PC. The Afterbirth DLC increased this to 4 player local co-op. The PlayStation 4 and Steam versions of the game are capable of both local and online multiplayer via PS4's "Share Play" and Steam's "Remote Play Together" features, as well as a dedicated online multiplayer system in early beta. (These versions can also support up to 4 players.)

Co-op players can join in at any time as a random baby, taking a Red Heart container away from Isaac and giving it to the second player. Subsequent pressing of the join button will despawn the baby, giving Isaac the Red Heart container back.

Babies share Isaac's stats except for health and damage; babies deal half of Isaac's damage. Babies always have flight, but they cannot interact with objects like items and pickups, except for certain special babies like Magnet Baby and Isaac 2.

Joining as a co-op baby will bring up a menu that allows the player to pick from 5 special babies. Dying as one of the available special babies will remove it from the pool.

If you start a normal game and player 2/3/4 presses Start while in the starting room, a mini character selection wheel displays at the top of the screen, with which that player can choose any unlocked character, or a random character. If a player dies without any revival items, they become a ghost baby that can only deal minimal damage and press buttons. Once the boss of a floor is killed, the dead player is reborn with all the items they once had, but with half a heart. When a boss is killed, the item pedestal will spawn as many items as there are players. All players share resources (coins, bombs, and keys), but each have their own hearts and items. All damage players do to bosses is reduced by 20%, including the damage from items, familiars, or bombs. Once all players die, it's game over.

Notes (Co-op Babies)

• Soul Hearts will be given to Player 2 before normal hearts, and half hearts will be given before full hearts. If player 2 dies, they can rejoin the game at the cost of another Red Heart container, as a new random Baby.
• The appearance of a majority of the co-op babies is solely cosmetic, but there are several "special" babies with beneficial effects. However, some special babies have detrimental effects.
• The last shooting familiar Isaac picked up will follow Player 2 instead of Isaac.
• If Isaac has more than 6 total hearts, including Soul Hearts and Black Hearts, Player 2 will take two hearts instead of one.
• If Isaac has a maximum of 12 hearts, including Soul Hearts and Black Hearts, Player 2 will take three hearts instead of one or two.
• The maximum amount of hearts Player 2 can have is three Red Hearts and one Soul Heart, using Scapular.
  • This limit increases by one Red Heart container, Soul Heart, or Black Heart when using Red Baby, Blue Baby, or Black Baby, respectively.
• Because at least 1.5 hearts are required for co-op, Player 2 cannot join when playing as The Lost.
• On the Nintendo Switch, you must restart the game after setting up the controllers or the join button will not work.

Strategy (True Co-op)

Main Page: Repentance Co-op

• Magdalene not only heals herself with Yum Heart, but also heals all other co-op players for a Half Red Heart. It's best to pair Magdalene up with characters who benefit or rely heavily on red health, such as Samson, The Forgotten, or Bethany.
• Cain can pair well with Lazarus, as Cain can take Lazarus' pill to have it be a guaranteed positive or neutral pill for Cain.
  • Lucky Foot will not convert pills unless Cain holds them, so it can still be a negative pill if used by Lazarus.
• Tainted Lost's reroll mechanic will apply in co-op, but this still includes the reroll of any items not labelled as "offensive".
  • Since there will be significantly less health-up sources as a result, it's recommended to pair Tainted Lost with characters who can't use red health, like ???, Keeper, Tainted Judas, Tainted ???, Tainted Keeper, Tainted Forgotten, or Tainted Bethany. Tainted Cain can also work, since his Bag of Crafting entirely bypasses the reroll mechanic.
• Keeper/ Tainted Keeper will not replace heart drops with flies when paired with other characters that use hearts.
• On kill effects such as Infestation 2, Lusty Blood, or Tainted Keeper's coin drops will trigger for the player holding it regardless of which player killed the enemy.
  • Similarly, effects that trigger on damage, such as It Hurts trigger on players who take damage, regardless of who took damage.
• Tainted Magdalene synergizes with Tainted Bethany as due to Tainted Maggy's generation of heart pickups, Tainted Bethany can quickly accumulate Blood Charges.
• Tainted Isaac can be a viable choice for a character, as the changed item pedestals benefit all players, not just Tainted Isaac.
• Due to the overall lack of items, visiting Curse rooms becomes a lot more viable, especially since one can play as a character that mitigates damage from Curse Rooms, such as Tainted Judas with his innate Dark Arts.
• Similarly to Jacob and Esau, if you time it properly, both items can be acquired from alternate path treasure rooms.

Rebirth babies

Special Babies

These Babies have special effects that may help or hinder the player.

ID	Appearance	Name	Description
0		Spider Baby	Occasionally spawns a spider.
1		Love Baby	Drops a heart pickup when killed. Can also drop soul hearts.
2		Bloat Baby	Spawns with a Pretty Fly.
3		Water Baby	Explodes into tears when it dies.
4		Psy Baby	Spawns with homing tears.
5		Cursed Baby	Attracts enemies and enemy tears.
6		Troll Baby	Spawns troll bombs beneath itself at random times, and always spawns one upon death.
7		Ybab	Scrambles buttons associated with tear shot direction.
8		Cockeyed Baby	Shoots tears diagonally, similar to the effect of the R U a Wizard? pill.
9		Host Baby	Spawns one to three hostile Spiders upon death.
10		Lost Baby	Constantly bleeds small puddles of red creep which can damage enemies. Releases a larger puddle of creep upon death. Defeat Mom's Heart on Hard mode as Isaac to unlock it.
11		Cute Baby	Defeat Mom's Heart on Hard mode as Magdalene to unlock it.
12		Crow Baby	Deals contact damage to enemies. Defeat Mom's Heart on Hard mode as Eve to unlock it.
13		Shadow Baby	Fires red blood shots and deals slightly more damage than other babies. Defeat Mom's Heart on Hard mode as Judas to unlock it.
14		Glass Baby	Drops a random pickup on death. Defeat Mom's Heart on Hard mode as Cain to unlock it.
15		Gold Baby	Drops 1-3 coins upon death.
16		Cy-Baby	Spawns with an effect similar to Tech.5, randomly firing lasers alongside normal tears.
17		Bean Baby	Farts when hit, like The Black Bean effect.
18		Mag Baby	Shiny silver baby that attracts coins.
19		Wrath Baby	Spawns a bomb pickup when killed.
20		Wrapped Baby	Explodes when hit. Defeat Mom's Heart on Hard mode as Azazel Defeat Mom's Heart on Hard mode as Lazarus to unlock it.
21		Begotten Baby	Shoots large, slow moving tears that have a chance to cause fear. Defeat Mom's Heart on Hard mode as Lazarus Defeat Mom's Heart on Hard mode as Azazel to unlock it.
22		Dead Baby	Has a chance to spawn a Blue fly upon killing an enemy. Defeat Mom's Heart on Hard mode as ??? to unlock it.
23		Fighting Baby	Appears to throw its tears rather than crying them. Drops a heart pickup upon death. Defeat Mom's Heart on Hard mode as Samson to unlock it.
24		-0- Baby	Immune to all forms of damage. Leaving the game as this baby causes a different baby to spawn in its place. Defeat Mom's Heart on Hard mode as The Lost to unlock it.
25		Glitch Baby	Turns into a random baby at the start of each floor. Defeat Mom's Heart on Hard mode as Eden to unlock it.
26		Magnet Baby	Cannot fire tears. Can pick up items and open chests.
122		Isaac 2	Cannot fire tears. Can pick up items and open chests. (This was reverted to just a cosmetic baby in Afterbirth.)

Normal Babies

These Babies are purely cosmetic and do not have any special behaviors.

ID	Appearance	Name	Description
59		Big Eyes Baby	A baby with big eyes.
60		Sleep Baby	A sleeping baby.
61		Zombie Baby	An undead baby.
62		Goat Baby	A baby that looks like a goat.
63		Butthole Baby	A baby with an anus for a face.
64		Eye Patch Baby	A baby that looks remarkably similar to Cain.
65		Blood Eyes Baby	A baby who is crying blood.
66		Mustache Baby	A baby with a mustache.
67		Spittle Baby	A baby who seems to be drooling.
68		Brain Baby	A baby that looks like it has the item The Mind.
69		3 Eyes Baby	A baby with three eyes.
70		Viridian Baby	Reference to the VVVVVV character of the same name.
71		Blockhead Baby	A baby with a blocky head.
72		Worm Baby	A baby that looks like Little Chubby.
73		Lowface Baby	A baby with a lowered face.
74		Alien Hominid Baby	Reference to the game Alien Hominid by The Behemoth.
75		Bomb Baby	A baby with a bomb for a head.
76		Video Baby	Reference to Commander Video, the main character of the BIT.TRIP series.
77		Parasite Baby	A baby that seems to be a parasite.
78		Derp Baby	A reference to the internet meme, DERP.
79		Lobotomy Baby	A baby who seems to have been lobotomized.
80		Choke Baby	A baby that looks to have been choked to death.
81		Scream Baby	Reference to Edvard Munch's "The Scream".
82		Gurdy Baby	A baby that looks like Gurdy.
83		Ghoul Baby	A baby that has large red eyes and fangs.
84		Goatee Baby	A baby with a goatee.
85		Shades Baby	A baby with sunglasses.
86		Statue Baby	A baby that is composed of stone.
87		Bloodsucker Baby	A baby with blood coming out of its mouth and eyes.
88		Bandaid Baby	A baby with a bandage on its head.
89		Eyebrows Baby	A baby with thick eyebrows.
90		Nerd Baby	A baby with square glasses.
91		Boss Baby	Based on Newgrounds' Agnry Faic.
92		Turd Baby	A baby composed of poop.
93		O Baby	A baby making an "O" face.
94		Square Eyes Baby	A baby with square eyes.
95		Teeth Baby	A baby with noticeable teeth.
96		Frown Baby	A frowning baby.
97		Tongue Baby	A baby whose tongue is sticking out.
98		Half Head Baby	A baby with the top half of its head missing.
99		Makeup Baby	A baby wearing makeup.
100		Ed Baby	Appears similar to Edmund McMillen, the creator of the game.
101		D Baby	Appears similar to Danielle, Edmund's wife.
102		Guppy Baby	A baby that looks like Edmund's first cat, Guppy.
103		Puke Baby	A baby that's vomiting.
104		Dumb Baby	A smiling blue baby.
105		Lipstick Baby	A baby wearing an excess amount of lipstick.
106		Aether Baby	Reference to Aether, another one of Edmund McMillen's games.
107		Brownie Baby	Reference to Brownie, a character from Super Meat Boy.
108		VVVVVV Baby	Reference to Captain Viridian, the main character of VVVVVV.
109		Nosferatu Baby	A reference to the movie, Noseferatu.
110		Pubic Baby	A baby with the cosmetic effect of the pill Puberty.
111		Eyemouth Baby	A baby with an eye in its mouth.
112		Weirdo Baby	A frowning blue baby.
113		V Baby	A baby with a red "V" on its head.
114		Strange Mouth Baby	A baby with the ":3" face.
115		Masked Baby	A baby with a black mask and red eyes.
116		Cyber Baby	A reference to the cyber men from Doctor Who.
117		Axe Wound Baby	Fires tears from its wound.
118		Statue Baby	A petrified baby.
119		Grin Baby	A grinning baby.
120		Upset Baby	A baby who looks upset.
121		Plastic Baby	A baby that looks extraterrestrial.
122		Monochrome Baby	A baby that is possibly a reference to the character Monoko from Yume Nikki.
123		One Tooth Baby	A baby with a single tooth.
124		Tusks Baby	A baby with two large tusks.
125		Hopeless Baby	A black depressed baby.
126		Big Mouth Baby	A baby with a big mouth.
127		Pee Eyes Baby	A baby with urine in its eyes.
128		Earwig Baby	A baby that looks like an earwig.
129		Ninkumpoop Baby	A baby that appears to be yawning.
130		Strange Shape Baby	A baby with an almond shaped head.
131		Bugeyed Baby	A baby with bugeyes.
132		Freaky Baby	A baby with a large mouth and sharp teeth.
133		Crooked Baby	A baby whose eyes are off center.
134		Spider Legs Baby	A baby that looks like a spider.
135		Smiling Baby	A smiling baby.
136		Tears Baby	A crying baby.
137		Bowling Baby	A brown baby.
138		Mohawk Baby	A baby with a mohawk.
139		Rotten Meat Baby	A baby that appears to be a rotten version of Meatboy.
140		No Arms Baby	A baby with no arms.
141		Twin Baby 2	A baby that has a blue bow.
142		Ugly Girl Baby	A yellow baby with a pink bow.
143		Chompers Baby	A baby that bears a slight resemblance to Scolex.
144		Camillo Jr. Baby	A baby that looks like the enemy Camillo Jr.
145		Eyeless Baby	A baby with no eyes.
146		Sloppy Baby	A baby with a crooked mouth.
147		Bluebird Baby	A blue baby with wings.
148		Fat Baby	A baby that looks like Gluttony.
149		Butterfly Baby	A baby that appears to look like a winged Pikmin from Pikmin 3.
150		Goggles Baby	A baby with goggles.
151		Apathetic Baby	A baby that seems to be bored.
152		Cape Baby	A baby with a cape.
153		Sorrow Baby	A blue baby with a grimace on its face.
154		Rictus Baby	A baby with a frown of pain on its face.
155		Awaken Baby	A baby with closed eyes.
156		Puff Baby	A reference to Kirby.
157		Attractive Baby	Another baby with the ":3" face.
158		Pretty Baby	A baby with eyeshadow.
159		Cracked Infamy Baby	A baby with a cracked Infamy mask.
160		Distended Baby	A baby with twisted arms.
161		Mean Baby	A green baby with a grumpy look.
162		Digital Baby	A green baby that has the static T.V. effect.
163		Helmet Baby	A baby with a helmet.
164		Black Eye Baby	A baby with a black eye.
165		Lights Baby	A baby with white eyes.
166		Spike Baby	A baby with a spike on its head.
167		Worry Baby	A baby with blue skin and a frown.
168		Ears Baby	A baby with animal-like ears.
169		Funeral Baby	A baby with a tuxedo.
170		Libra Baby	A baby that looks like it has the item Libra.
171		Gappy Baby	An angry baby with red eyes.
172		Sunburn Baby	A red baby.
173		Ate Poop Baby	A baby who ate poop.
174		Electric Baby	Reference to Pikachu from Pokémon.
175		Blood Hole Baby	A baby with a bloody anus for a face.
176		Transforming Baby	Reference to Optimus Prime from Transformers.
177		Aban Baby	Reference to Aban Hawkins from 1001 Spikes.
178		Bandage Girl Baby	Reference to Bandage Girl from Super Meat Boy.
179		Piece A Baby	Reference to Tetris.
180		Piece B Baby	Reference to Tetris.
181		Spelunker Baby	Reference to the Spelunker from Spelunky.
182		Frog Baby	A baby that looks like a frog.
183		Crook Baby	A baby with a bandit's eye mask.
184		Don Baby	Reference to Donatello from Teenage Mutant Ninja Turtles.
185		Web Baby	A baby with strands of spider silk stuck on it.
186		Faded Baby	A baby that appears to be phasing out of existence.
187		Sick Baby	A sickly baby.
188		Dr Fetus Baby	Reference to Dr. Fetus from Super Meat Boy.
189		Spectral Baby	A baby that is translucent in appearance.
190		Red Skeleton Baby	A reference to the Red Skeleton enemy from Castlevania.
191		Skeleton Baby	A reference to the Skeleton enemy from Castlevania.
192		Jammies Baby	A baby with pajamas.
193		New Jammies Baby	A baby with red pajamas.
194		Cold Baby	A baby with a snowman appearance.
195		Old Man Baby	A baby that appears to look like an old man.
196		Spooked Baby	A scared baby.
197		Nice Baby	A baby with a neutral expression.
198		Dots Baby	A baby with blood splattered on it.
199		Peeling Baby	A baby whose skull is exposed.
200		Small Face Baby	A baby with an abnormally small face.
201		Good Baby	A happy baby with blonde hair.
202		Blindfold Baby	A baby with a blindfold.
203		Pipe Baby	A baby with a pipe stuck in its head.
204		Dented Baby	A baby with a dented head.
205		Steven Baby	Reference to another one of Edmund McMillen's games, Time Fcuk.
206		Monocle Baby	A baby wearing a monocle.
207		Belial Baby	A baby that looks like it used The Book of Belial.
208		Monstro Baby	A baby that looks like Monstro.
209		Fez Baby	A baby wearing a fez, possibly a reference to the game, Fez.
210		MeatBoy Baby	Reference to the titular character from Super Meat Boy.
211		Skull Baby	A skeletal baby.
212		Conjoined Baby	A baby with a conjoined twin.
213		Skinny Baby	A baby that looks malnourished.
214		Basic Spider Baby	A baby that has the characteristics of a spider.
215		Shopkeeper Baby	A baby that looks like a shopkeeper.
216		Fancy Baby	A baby with a bowtie.
217		Chubby Baby	A chubby baby with three hairs.
218		Cyclops Baby	A baby that looks like it has the item Polyphemus.
219		Isaac Baby	A baby that looks like Isaac.
220		Plug Baby	A baby that looks like an electrical outlet.
221		Drool Baby	A baby that is drooling.
222		Wink Baby	A baby that is winking.
223		Pox Baby	A baby that has smallpox or chickenpox.
224		Onion Baby	A baby with a head that looks like the item The Sad Onion.
225		Zipper Baby	A pale baby with a zipper on its torso.
226		Buckteeth Baby	A baby with buckteeth.
227		Beard Baby	A bearded baby.
228		Hanger Baby	A baby that appears to have the item Wire Coat Hanger.
229		Vampire Baby	A vampiric baby.
230		Tilt Baby	A baby whose face is tilted.
231		Bawl Baby	A baby who looks to be crying more than usual.
232		Lemon Baby	A baby with a lemon head.
478		Tooth Baby	A baby with one tooth.
479		Haunt Baby	A ghostly baby.

Afterbirth babies

Special Babies

These Babies have special bonuses that will aid the player in some way.

ID	Appearance	Name	Description
27		Black Baby	Spawns with an extra black heart. Defeat Mega Satan as Azazel to unlock it.
28		Red Baby	Spawns with an extra red heart. Defeat Mega Satan as Magdalene to unlock it.
29		White Baby	Gives Isaac an eternal heart when it spawns. Defeat Mega Satan as The Lost to unlock it.
30		Blue Baby	Spawns with an extra soul heart. Defeat Mega Satan as ??? to unlock it.
31		Rage Baby	Occasionally briefly increases Isaac's damage by 2. Defeat Mega Satan as Samson to unlock it.
32		Cry Baby	Occasionally briefly increases Isaac's tears by 1. Defeat Mega Satan as Isaac to unlock it.
33		Yellow Baby	Occasionally briefly increases Isaac's speed by 0.15. Defeat Mega Satan as Eden to unlock it.
34		Long Baby	Occasionally briefly increases Isaac's range by 2, shot speed by 0.5, and tear falling speed. Defeat Mega Satan as Lazarus to unlock it.
35		Green Baby	Occasionally briefly increases Isaac's luck by 2. Defeat Mega Satan as Cain to unlock it.
36		Lil' Baby	Occasionally briefly decreases Isaac's size. Defeat Mega Satan as Eve to unlock it.
37		Big Baby	Occasionally briefly increases Isaac's size. Defeat Mega Satan as Lilith to unlock it.
38		Brown Baby	Occasionally briefly gives Isaac the Butt Penny effect. Defeat Mega Satan as Judas to unlock it.
39		Noose Baby	Occasionally briefly gives Isaac the Transcendence effect, granting flight. Defeat Mega Satan as Keeper to unlock it.
40		Hive Baby	Occasionally briefly gives Isaac the Hive Mind effect, doubling the damage dealt by blue spiders and blue flies. Earn all Hard mode Completion Marks as ??? to unlock it.
41		Buddy Baby	Occasionally briefly gives Isaac the Guillotine effect, detaching Isaac's head and increasing damage and tears. Earn all Hard mode Completion Marks as Isaac to unlock it.
42		Colorful Baby	Upon joining, fully heals Isaac, similar to the rainbow poop effect. Earn all Hard mode Completion Marks as Magdalene to unlock it.
43		Whore Baby	Occasionally briefly gives Isaac the Whore of Babylon effect, increasing damage and speed. Earn all Hard mode Completion Marks as Eve to unlock it.
44		Cracked Baby	Earn all Hard mode Completion Marks as Eden to unlock it.
45		Dripping Baby	Occasionally briefly gives Isaac Anemic, increasing range by 5 and causing Isaac to leave a trail of blood that damages enemies. Earn all Hard mode Completion Marks as Lazarus to unlock it.
46		Blinding Baby	Upon death, activates the effect of XIX - The Sun, fully restoring Isaac's red hearts, deals 100 damage to all enemies in the room, and revealing the map for the current floor. Use Blank Card while holding XIX - The Sun to unlock it.
47		Sucky Baby	Has an aura around itself that damages enemies while they are inside, similar to Succubus. Earn all Hard mode Completion Marks as Azazel to unlock it.
48		Dark Baby	Occasionally provides a brief boost to all of Isaac's stats. Earn all Hard mode Completion Marks as Lilith to unlock it.
49		Picky Baby	Occasionally briefly gives Isaac the Paper Clip effect. Earn all Hard mode Completion Marks as Cain to unlock it.
50		Revenge Baby	Occasionally briefly increases Isaac's damage. Earn all Hard mode Completion Marks as Samson to unlock it.
51		Belial Baby	Occasionally briefly gives Isaac the The Book of Belial effect, increasing damage. Earn all Hard mode Completion Marks as Judas to unlock it.
52		Sale Baby	Occasionally briefly gives Isaac the Steam Sale effect, halving the prices of all shop items. Earn all Hard mode Completion Marks as Keeper to unlock it.
53		Goat Head Baby	Occasionally briefly gives Isaac the Goat Head effect, guaranteeing that a Devil room or angel room will open if a boss room is completed while the effect is active. Defeat Mom's Heart on Hard mode as Lilith to unlock it.
54		Super Greed Baby	Has the Head of the Keeper effect, firing coin tears that have a chance to spawn a coin upon hitting an enemy. Defeat Mom's Heart on Hard mode as Keeper to unlock it.

Normal Babies

These Babies are purely cosmetic and do not have any special behaviors.

ID	Appearance	Name	Description
233		Punkboy Baby	A baby dressed as a punk rocker boy.
234		Punkgirl Baby	A baby dressed as a punk rocker girl.
235		Computer Baby	A baby with a computer for a head.
236		Mask Baby	A baby wearing a mask.
237		Gem Baby	A baby that looks like it's made of crystal.
238		Shark Baby	A baby that looks like a shark.
239		Beret Baby	A baby that's wearing a beret.
240		Blisters Baby	A baby covered in blisters.
241		Radioactive Baby	A sickly green baby.
242		Beast Baby	A baby that looks like a beast.
243		Dark Baby	A very dark baby.
244		Snail Baby	A baby that looks like a snail.
245		Blood Baby	A baby that looks like a drop of blood.
246		8 Ball Baby	A baby with an 8 ball for a head.
247		Wisp Baby	A wispy baby.
248		Cactus Baby	A baby that looks like a cactus.
249		Love Eye Baby	A pink baby with a heart for an eye.
250		Medusa Baby	A baby that resembles Medusa.
251		Nuclear Baby	A baby that looks like a mushroom cloud.
252		Purple Baby	A strange purple baby.
253		Wizard Baby	A baby with a wizard hat.
254		Earth Baby	A baby whose head looks like planet Earth.
255		Saturn Baby	A baby with a ring around its head.
256		Cloud Baby	A baby made of cloud.
257		Tube Baby	A baby with a tube connecting both eyes.
258		Rocker Baby	A baby dressed as a rock fan.
259		King Baby	A baby with a crown.
260		Coat Baby	A baby wearing a winter coat.
261		Viking Baby	A baby with a Viking helmet.
262		Panda Baby	A baby that looks like a panda.
263		Raccoon Baby	A baby that looks like a raccoon.
264		Bear Baby	A baby that looks like a grizzly bear.
265		Polar Bear Baby	A baby that looks like a polar bear.
266		Lovebear Baby	A baby that looks like a Care Bear.
267		Hare Baby	A baby that looks like a rabbit.
268		Squirrel Baby	A baby that looks like a squirrel.
269		Tabby Baby	A baby that looks like a cat.
270		Porcupine Baby	A baby that looks like a porcupine.
271		Puppy Baby	A baby that looks like a puppy.
272		Parrot Baby	A baby that looks like a parrot.
273		Chameleon Baby	A baby that looks like a Chameleon.
274		Boulder Baby	A baby made of rocks.
275		Aqua Baby	An aqua-blue baby.
276		Gargoyle Baby	A baby that resembles a gargoyle.
277		Spiky Demon Baby	A baby that looks like a spiky demon.
278		Red Demon Baby	A baby that looks like a red demon.
279		Orange Demon Baby	A baby that looks like an orange demon.
280		Eye Demon Baby	A baby with an eye for a head.
281		Fang Demon Baby	A baby with big fangs.
282		Ghost Baby	A baby that looks like a ghost.
283		Arachnid Baby	A baby that looks like a spider.
284		Bony Baby	A baby that looks like a Bony.
285		Big Tongue Baby	A baby with a big tongue.
286		3D Baby	A baby wearing 3D glasses.
287		Suit Baby	A baby in a nice suit.
288		Butt Baby	A baby with a butt for a face.
289		Cupid Baby	A baby that looks like Cupid.
290		Heart Baby	A baby with a heart-shaped head.
291		Killer Baby	A baby that looks like Jason Voorhees from the "Friday the 13th" horror movie series.
292		Lantern Baby	A baby that looks like Ash Williams from the Evil Dead series.
293		Banshee Baby	A baby that looks like a banshee.
294		Ranger Baby	A baby that looks like a Red Power Ranger.
295		Rider Baby	A baby that looks like a Kamen Rider.
296		Choco Baby	A baby made of chocolate.
297		Woodsman Baby	A baby dressed as a hiker.
298		Brunette Baby	A baby with brown hair
299		Blonde Baby	A baby with blonde hair.
300		Blue Hair Baby	A baby with blue hair
301		Bloodied Baby	A baby covered in blood.
302		Cheese Baby	A baby made of cheese.
303		Pizza Baby	A baby made of pizza.
304		Hotdog Baby	A baby that is also a hotdog.
305		Nature Baby	A naked baby with a leaf.
306		Borg Baby	A robotic baby.
307		Corrupted Baby	A baby with seems to be covered by an alien life.
308		X Mouth Baby	A gagged baby.
309		X Eyed Baby	A comically dead baby.
310		Starry Eyed Baby	A baby with starry eyes.
311		Surgeon Baby	A baby ready for surgery.
312		Sword Baby	A baby that's a sword.
313		Monk Baby	A baby that's a monk.
314		Disco Baby	A funky baby with an afro
315		Puzzle Baby	A baby with a "Rubik's Cube" for a head
316		Speaker Baby	A baby that has a speaker for a head.
317		Scary Baby	A baby that resembles Jeff the Killer.
318		Fireball Baby	A fireball with eyes. Possibly a reference to the fire enemy in the Donkey Kong and Mario games.
319		Maw Baby	A baby that's just a mouth.
320		Exploding Baby	A baby that's a bomb.
321		Cupcake Baby	A baby that's also a cupcake.
322		Skinless Baby	A baby without skin.
323		Ballerina Baby	A baby wearing a tutu.
324		Goblin Baby	A baby that resembles a goblin.
325		Cool Goblin Baby	A green baby with brown hair and cool shades.
326		Geek Baby	A baby with black hair and nerdy glasses.
327		Long Beard Baby	A baby with a long beard.
328		Muttonchops Baby	A baby with muttonchops.
329		Spartan Baby	A baby that resembles King Leonidas from 300.
330		Tortoise Baby	A baby that resembles Vectorman from the game Vectorman
331		Slicer Baby	A baby that resembles Shredder.
332		Butterfly Baby	A baby with butterfly wings.
333		Homeless Baby	A baby that resembles a homeless person.
334		Lumberjack Baby	A baby that resembles a lumberjack.
335		Cyberspace Baby	A baby that resembles something from the Tron universe.
336		Hero Baby	A baby that resembles Red from Gunstar Heroes.
337		Boxers Baby	A baby that resembles Arthur from Ghosts & Goblins (in his boxers).
338		Wing Helmet Baby	A baby that resembles Opa-Opa.
339		X Baby	A baby with an X for a head.
340		O Baby	A baby with an O for a head.
341		Vomit Baby	A baby with vomit coming from its mouth.
342		Merman Baby	A baby that resembles Aquaman.
343		Cyborg Baby	Might be a reference to a Cyborg from a novel/movie/game?
344		Barbarian Baby	A baby that resembles the Barbarian from Diablo.
345		Locust Baby	A baby that resembles a locust.
346		Twotone Baby	A completely white baby with a black outline.
347		2600 Baby	A baby that resembles an Atari 2600 sprite.
348		Fourtone Baby	A baby with a minimal colour sprite.
349		Grayscale Baby	A baby colored with several shades of gray.
350		Rabbit Baby	A baby that resembles Oswald the Lucky Rabbit.
351		Mouse Baby	A baby that resembles an old-style Mickey Mouse.
352		Critter Baby	A critter that looks white and hairy. Might be a reference to the movie Critters.
353		Blue Robot Baby	A baby that resembles Mega Man.
354		Pilot Baby	A baby that resembles Jason from Blaster Master.
355		Red Plumber Baby	A baby that resembles Mario.
356		Green Plumber Baby	A baby that resembles Luigi.
357		Yellow Plumber Baby	A baby that resembles Wario.
358		Purple Plumber Baby	A baby that resembles Waluigi.
359		Tanooki Baby	A baby that's wearing a Tanooki Suit.
360		Mushroom Man Baby	A baby that resembles Toad.
361		Mushroom Girl Baby	A baby that resembles Toadette.
362		Cannonball Baby	A baby that resembles a Chain Chomp.
363		Froggy Baby	A baby that's wearing a Frog Suit.
364		Turtle Dragon Baby	A baby that resembles Bowser.
365		Shell Suit Baby	A baby wearing a Hammer Suit.
366		Fiery Baby	A baby wearing a Fire Suit.
367		Mean Mushroom Baby	A baby that resembles a Goomba.
368		Arcade Baby	A baby that resembles Pac-Man.
369		Scared Ghost Baby	A blue ghost with a scared expression.
370		Blue Ghost Baby	A baby that resembles Inky.
371		Red Ghost Baby	A baby that resembles Blinky.
372		Pink Ghost Baby	A baby that resembles Pinky.
373		Orange Ghost Baby	A baby that resembles Clyde.
374		Pink Princess Baby	A baby that resembles Princess Peach.
375		Yellow Princess Baby	A baby that resembles Princess Daisy.
376		Dino Baby	A baby that resembles Yoshi.
377		Elf Baby	A baby that resembles Link.
378		Dark Elf Baby	A baby that resembles Dark Link
379		Dark Knight Baby	A baby that resembles a Darknut
380		Octopus Baby	A baby that resembles an Octorok.
381		Orange Pig Baby	A baby that resembles an orange Moblin.
382		Blue Pig Baby	A baby that resembles a blue Moblin.
383		Elf Princess Baby	A baby that resembles Princess Zelda.
384		Fishman Baby	A baby that resembles a Zora.
385		Fairyman Baby	A baby that resembles Tingle.
386		Imp Baby	A baby that resembles Midna.
387		Worm Baby	A baby that resembles Earthworm Jim.
388		Blue Wrestler Baby	A baby that looks like the blue player in Smash TV.
389		Red Wrestler Baby	A baby that looks like the red player in Smash TV.
390		Toast Baby	A baby that resembles Powdered Toast Man.
391		Roboboy Baby	A baby that resembles Astro Boy.
392		Liberty Baby	A baby that resembles the Statue of Liberty.
393		Dream Knight Baby	A baby that resembles Meta Knight.
394		Cowboy Baby	A baby that's wearing a cowboy outfit.
395		Mermaid Baby	A baby that resembles Ariel.
396		Plague Baby	A baby wearing a plague doctor outfit.
397		Space Soldier Baby	A baby that resembles a Warhammer 40k Space Marine.
398		Dark Space Soldier Baby	A baby that resembles a Warhammer 40k Chaos Space Marine.
399		Gas Mask Baby	A baby that's wearing a gas mask.
400		Tomboy Baby	A baby that resembles Sheik from the Legend of Zelda franchise.
401		Corgi Baby	A baby that looks like a corgi.
402		Unicorn Baby	A baby that looks like a unicorn.
403		Pixie Baby	A baby that resembles Tinkerbell.
404		Referee Baby	A baby wearing a referee outfit.
405		Deal With It Baby	A baby with a goatee and sunglasses.
406		Astronaut Baby	A baby that's wearing an astronaut outfit.
407		Blurred Baby	A baby with a blur effect across its privates.
408		Censored Baby	A baby with a censor bar across its privates.
409		Cool Ghost Baby	A baby that resembles the character Shades (Sukezaemon) from Ufouria: The Saga.
410		Gills Baby	A baby that resembles the character Gil (Jennifer) from Ufouria: The Saga.
411		Blue Hat Baby	A baby that resembles the character Bop-Louie (Hebe) from Ufouria: The Saga.
412		Catsuit Baby	A baby that's wearing a cat outfit. Also resembles the character Oh-Chan from Ufouria: The Saga (Japanese version).
413		Pirate Baby	A baby that's wearing a pirate outfit.
414		Super Robo Baby	A baby that resembles Tekkaman the Space Knight.
415		Lightmage Baby	A baby that resembles the white mage class from Final Fantasy.
416		Puncher Baby	A baby that resembles the warrior class from Final Fantasy.
417		Holy Knight Baby	A baby that resembles the monk class from Final Fantasy.
418		Shadowmage Baby	A baby that resembles the black mage class from Final Fantasy.
419		Firemage Baby	A baby that resembles the red mage class from Final Fantasy.
420		Priest Baby	A baby that's wearing a priest outfit.
421		Zipper Baby	A baby with a zipped mouth.
422		Bag Baby	A baby with a bag over its head.
423		Sailor Baby	A baby that's wearing a sailor outfit.
424		Rich Baby	A baby with a top hat and monocle.
425		Toga Baby	A baby in an ancient Roman outfit.
426		Knight Baby	A baby that resembles a Darknut from The Legend of Zelda.
427		Black Knight Baby	A baby that resembles a black Darknut from The Legend of Zelda.

Afterbirth† babies

Special Babies

These Babies have special bonuses that will aid the player in some way.

ID	Appearance	Name	Description
55		Mort Baby	Spawns a blue fly, and spawns a new blue fly whenever its blue fly is destroyed. Defeat Mega Satan as Apollyon to unlock it. The sprite greatly resembles Rotten Baby.
56		Apollyon Baby	Spawns with two Pretty Flies. Earn all Hard mode Completion Marks as Apollyon to unlock it.
57		Bone Baby	Wields a melee bone club instead of shooting tears, similarly to The Forgotten. Earn all Hard mode Completion Marks as The Forgotten to unlock it.
58		Bound Baby	Is bound to Isaac, similarly to The Forgotten's soul. Shoots spectral tears. Defeat Mega Satan as The Forgotten to unlock it.

Normal Babies

These Babies are purely cosmetic and do not have any special behaviors.

ID	Appearance	Name	Description
428		Magiccat Baby	A baby that resembles the avatar of Tikara, the artist of the Isaac Tarot deck.
429		Little Horn Baby	A baby that resembles Little Horn.
430		Folder Baby	A baby with a folder for a head.
431		Driver Baby	A baby that is driving a car.
432		Dragon Baby	A baby that resembles a dragon.
433		Downwell Baby	A baby that resembles the player character from Downwell.
434		Cylinder Baby	A baby that is shaped like a cylinder.
435		Cup Baby	A baby with a teacup for a head.
436		Cave Robot Baby	A baby that resembles Quote from Cave Story.
437		Breadmeat Hoodiebread Baby	A toothy baby with a slice of toast for a head that resembles Breadmeat, a member of the Isaac community.
438		Bigmouth Baby	A baby with a large, wide-open mouth.
439		Afro Rainbow Baby	A baby with a rainbow colored afro.
440		Afro Baby	A baby with an afro.
441		TV Baby	A baby with a television for a head.
442		Tooth Baby	A baby with a tooth for a head.
443		Tired Baby	A tired-looking baby.
444		Steroids Baby	A muscular baby.
445		Soap Monster Baby	A baby that resembles Balrog from Cave Story.
446		Rojen Whitefox Baby	A baby that resembles a white fox. (might be a reference?)
447		Rocket Baby	A baby that looks like a firework.
448		Nurf Baby	A baby that resembles D.Va from Overwatch.
449		Mutated Fish Baby	A baby that resembles Fish from Nuclear Throne.
450		Moth Baby	A baby that resembles Moth from Creepy Castle.
451		Buttface Baby	A baby with a butt for a face.
452		Flying Candle Baby	A baby that looks like a candle.
453		Graven Baby	A baby with long hair. (might be a reference?)
454		Gizzy Chargeshot Baby	A baby that resembles Gizzy from ChargeShot.
455		Green Koopa Baby	A baby that resembles a green koopa from Mario.
456		Handsome MrFrog Baby	A baby that resembles Handsome Mr. Frog from the game of the same name.
457		Pumpkin Guy Baby	A baby with a pumpkin for a head wearing a purple rag. Possible reference to Terraria's Pumpking.
458		Red Koopa Baby	A baby that resembles a red koopa from Mario.
459		Sad Bunny Baby	A baby that looks like a crying rabbit. This is a reference to the sprites creator, Mort Mort (MnrArt) and their character Sad Bunny Face.
460		Saturn Baby	A baby that resembles the main character from Sgt. Saturn.
461		Toast Boy Baby	A baby with a slice of bread for a head. This is a reference to the sprite's creator, Mort Mort (MnrArt) and their character Toast Boy.
462		Voxdog Baby	A baby that resembles Vox the Dog.
463		404 Baby	A baby that has the Error trinket for a head.
464		Arrowhead Baby	A baby with an arrow through its head.
465		Beanie Baby	A baby wearing a green beanie.
466		Blindcursed Baby	A baby with the Curse of the Blind's question mark for a head.
467		Burning Baby	A baby that's been burnt to a crisp.
468		Cursor Baby	A baby that looks like a mouse cursor.
469		Flybaby	A baby that looks like a fly.
470		Headphone Baby	A baby wearing headphones.
471		Knife Baby	A baby with a knife for a head.
472		Mufflerscarf Baby	A baby wearing a scarf.
473		Robbermask Baby	A baby wearing a stereotypical robber's ski mask.
474		Scoreboard Baby	A baby with a digital number display, like those at a sporting event or on an alarm clock, for a face.
475		So Many Eyes Baby	A baby with eyes all over its body.
476		Text Baby	A baby made out of text characters. (ASCII art)
477		Wing Baby	A baby with wings.
480		Imp Baby	A baby that resembles the modded character Fiend from Devil's Harvest MOD.
481		32bit Baby	A baby that resembles Isaac in a 32 bit style.
482		Adventure Baby	A baby that resembles Finn the Human from Adventure Time.
483		Bubbles Baby	A baby made entirely of tar.
484		Bulb Baby	A baby that's very bright for his age.
485		Cool Orange Baby	A baby that resembles a very cool orange with sunglasses.
486		Crazy Ghost Baby	A baby that resembles Crazy Diamond from JoJo's Bizarre Adventure. (Also possibly a reference to the modded character.)
487		Cursed Pillow Baby	A baby that's unfortunately pillow shaded.
488		Egg Baby	A baby that resembles the modded item Greg the Egg.
489		Factory Baby	A baby that resembles a strange cyborg.
490		Falling Baby	A baby that resembles William Foster from Falling Down.
491		Funny Baby	A baby that resembles Sans from Undertale.
492		Gamer Baby	A baby that resembles an epic gamer. Inspired by a prominent member of the Binding of Isaac community.
493		Glittery Peach Baby	A baby resembling an oddly British Baby Plum.
494		Pompadour Baby	A baby that resembles Josuke from JoJo's Bizarre Adventure. (Also possibly a reference to the modded character.)
495		Head Kick Baby	A baby that resembles the Facepunch Logo.
496		Horn Baby	A baby that resembles the modded character Chronos.
497		Ichor Baby	A baby that resembles Ichor beasts from the game Heckland.
498		Ill Baby	A baby that resembles the modded boss Mahalath.
499		Lazy Baby	A baby that resembles Garfield.
500		Mern Baby	Mern.
501		Necro Baby	A baby that resembles the Xenomorph from the Alien franchise.
502		Peeping Baby	A baby that resembles the modded boss The Peeping.
503		Penance Baby	A baby that resembles the modded character Sarah from Revelations.
504		Psychic Baby	A baby that resembles the modded character Mei.
505		Puppet Baby	A baby that resembles the costume for the modded item Pinhead from Happy Items Pack.
506		Reaper Baby	A baby that resembles the modded character Samael.
507		Road Kill Baby	A baby that got ran over.
508		Sausage Lover Baby	A baby that resembles _Kilburn, the lead developer for Antibirth.
509		Scribble Baby	A baby that resembles the modded character The Drawn.
510		Star Plant Baby	A baby that resembles the main character from Germination.
511		Twitchy Baby	A baby that resembles Twitch from Heckland.
512		Witch Baby	A baby that resembles the modded character Endor from Alphabirth.
513		Workshop Baby	A baby that references a common trope of workshop thumbnails when firing tears.
514		Hooligan Baby	A baby that resembles Čeda from LeatherIceCream's "Poor 4" animations.
515		Half Spider Baby	A baby that resembles Miroslav from LeatherIceCream's "Poor 4" animations.
516		Silly Baby	A baby that resembles Djole from LeatherIceCream's "Poor 4" animations.
517		Master Cook Baby	A baby that resembles Andre from LeatherIceCream's "Poor 4" animations.
518		Green Pepper Baby	A baby that resembles one of _Kilburn's characters.
519		Baggy Cap Baby	A baby that resembles one of _Kilburn's characters.
520		Stylish Baby	A baby resembling the character Ren from the currently unreleased game Shenanigans: World of Illusions.

Repentance babies

Special Babies

These Babies have special effects that may help or hinder the player.

ID	Appearance	Name	Description
59		Found Soul	Found Soul is a familiar that follows Isaac's exact movements, akin to Jacob and Esau, and shoots spectral tears. It is spawned by the trinket Found Soul. The familiar uses Isaac's tears, range, shot speed, and tear effects, and deals 0.5x Isaac's damage. The familiar has collision and can be separated. Holding down the "drop" button keeps the familiar in place. When Isaac places a bomb, the familiar will drop one as well. The familiar can also press Buttons. The familiar dies after taking any damage, and will respawn on the next floor.
60		Baby Lost White	A co-op player turns into this after dying. After the floor's boss is defeated, the player reverts to normal. It cannot fly over pits but does not take damage. Can fire very weak tears.
61		Baby Lost Black	A co-op player turns into this after dying if playing as Azazel. After the floor's boss is defeated, the player reverts to normal. It cannot fly over pits but does not take damage. Can fire very weak Brimstone with limited range.
62		Baby Lost Blue	A co-op player turns into this after dying if playing as ???. After the floor's boss is defeated, the player reverts to normal. It cannot fly over pits but does not take damage. Can fire very weak tears.
63		Baby Lost Grey	A co-op player turns into this after dying if playing as Keeper. After the floor's boss is defeated, the player reverts to normal. It cannot fly over pits but does not take damage. Fires a triple shot similar to The Inner Eye.
64		Wisp Baby	Defeat Mom's Heart or It Lives! on Hard mode as Bethany to unlock. Effect unknown.
65		Double Baby	Defeat Mom's Heart or It Lives! on Hard mode as Jacob and Esau to unlock. Shoots 20/20 style shots which deal 1.1 damage (compared to 1.4 damage of normal co-op babies).
66		Glowing Baby	Defeat Mega Satan as Bethany to unlock. Emits very bright light that covers huge part of the screen.
67		Illusion Baby	Defeat Mega Satan as Jacob and Esau to unlock. Effect not implemented yet.
68		Hope Baby	Earn all Hard mode Completion Marks as Bethany to unlock. Drops a half soul heart on death.
69		Solomon's Baby [A]	Earn all Hard mode Completion Marks as Jacob and Esau to unlock. This baby is composed of two parts and supposedly controls like Jacob and Esau but effect is not implemented yet.
70		Solomon's Baby [B]	This baby is a part of Solomon's baby and not accessible on its own but effect is not implemented yet.

Normal Babies

These Babies are purely cosmetic and do not have any special behaviors.

ID	Appearance	Name	Description
490		Ersatz Baby	Α baby resembling Falling Baby from Afterbirth+ with the same ID.
533		Thirteenth Baby	Α baby resembling D-13 from Star of Providence.
534		Berry Baby	A baby resembling the Golden Strawberry from Celeste. Referred to internally as "baby_goldberry", further cementing this similarity.
535		Eyebat Baby	A baby resembling Eyebats from Vagante.
536		Baby Is You	A baby resembling Baba from Baba Is You.
537		Vessel Baby	A baby resembling the Broken Vessel from Hollow Knight.
538		Rock Baby	A baby resembling Golem from the Devil's Harvest mod and the Fiend Folio mod.
539		Janitor Baby	A baby who resembles Smokes from the game Hell’s Janitor by HappyHead
540		Meaty Baby	A baby resembling Bertran from the Bertran mod.
541		Pig Baby	A baby resembling Mammon from the Retribution mod.
542		Pegasus Baby	A baby that doesn't look a whole lot like a pegasus. A reference to an original character by NotYourSagittarius.
543		Mr. E Baby	A mysterious baby. Potentially a reference to a meme posted by _Kilburn in the Isaac Discord, however, an identical image was also posted a year earlier in the Modding of Isaac Discord by a separate user, making the true origins unknown.
544		Slab Baby	A baby resembling a Slabfish from Team Abnormals' Minecraft mods.
545		Pog Baby	A floating Isaac head resembling the Twitch emote PogChamp.
546		Hive King Baby	A baby resembling the Hive King from the Team Bugulon game Hivemind.
547		Pill Ship Baby	A baby resembling the Pill Ship from the Team Bugulon game Lymphosite.
548		Point Baby	A baby resembling the main character of the Team Bugulon game Tricky Keys.
549		Wyrm Baby	A baby resembling the Gunwyrm from the Team Bugulon game Gunwyrm.
550		Bullet Baby	A baby wearing a hat that resembles a Bullet kin from Enter the Gungeon. Inspired by a prominent member of the Binding of Isaac community and one of Repentance's playtesters.
551		Purple Horse Baby	A decapitated horse head resembling Twilight Sparkle from My Little Pony. Inspired by a prominent member of the Binding of Isaac community and one of Repentance's playtesters.
552		Koala Baby	A decapitated koala head. Inspired by a prominent member of the Binding of Isaac community and one of Repentance's playtesters.
553		Cliff Hanger Baby	A baby with a question mark for a face that resembles a hanging Shopkeeper. Inspired by one of Repentance's playtesters.
554		Penguin Baby	A baby that is a penguin. Inspired by a prominent member of the Binding of Isaac community and one of Repentance's playtesters.
555		Kinda Loveable Baby	A baby that is loveable, but only kinda. Inspired by a prominent member of the Binding of Isaac community and one of Repentance's playtesters.
556		Cursed Room Baby	A baby that looks similar to an infamous Mausoleum room from Antibirth. Inspired by the room's creator and one of Repentance's playtesters.
557		Proto Baby	A baby resembling Prototype from OneShot.
558		Finger Baby	A baby resembling a Deployer - a block from a Minecraft mod called Create.
559		Bald Baby	A bald baby based on a Baldie from the RTS game Baldies.
560		Hex Baby	A baby that resembles a witch character.
561		Singing Baby	A baby resembling the Vocaloid singer Hatsune Miku.
562		Junk Baby	A baby that resembles Spamton from Deltarune.
563		Lucky Baby	A baby that resembles Konata Izumi from Lucky Star.
564		Finger Baby	A baby that resembles Mike Ehrmantraut from Breaking Bad. The name is a reference to the "Kid named Finger" internet meme.
565		Sucky Baby	A baby that resembles a Sucklet from itemLabel.
566		Door Mimic Baby	A baby that resembles The Door from Cave Story.
567		Kyuukyuu Baby	A baby that resembles Kyuukyuu-kun from Yume Nikki.
568		Moon Jelly Baby	A baby that resembles Moon Jelly Wizard from a Terraria mod called Spirit Mod.
569		Excelsior Baby	A baby that resembles Walker, an original character by community member RENREN. This baby is in reference to her Excelsior music mod.
570		Painful Baby	A baby that resembles Brad from LISA: The Painful.
571		Pointless Baby	A baby that resembles Alex from the LISA: The Pointless fangame.
572		Doleful Baby	A baby that resembles Rovert from the LISA: The Doleful fangame.
573		Cubic Baby	A baby that resembles a cube from FEZ.
574		Food Reviewer Baby	A baby that resembles a background character from the 2004 Spongebob Squarepants movie. This baby is a reference to community member BlorengeRhymes, who uses this character as his profile picutre.

Possessor

There is a hidden multiplayer game mode that allows a second player to control enemies and bosses in a way similar to Friend Finder. To access it, the second player should hold both bumpers on their gamepad and press the Start/Options button (On keyboard, the second player should hold Q and E, then press Enter). After this, a message saying that a player has joined as the possessor will appear in the Debug Console. It works properly for most normal enemies and some specific bosses, such as Ultra Greed, but for the rest, controls are limited or do not work at all.

Gallery

• 

  Concepts drawn for some Co-Op Baby designs.

• 

  Concepts drawn for unlockable co-op baby designs. Notably, all of Bethany's unlockable co-op babies made it in the Repentance DLC along with Double Baby but not the others (the final 3 being that Edith was scrapped as a character altogether for Antibirth and would never return as a realized concept).

Bugs

Bug!	PC If the co-op player joins using a keyboard, the join button and the fire button must be pressed simultaneously to bring up the special baby menu. It may take several tries, as the timing seems to be almost frame-perfect.

Bug!	Special co-op babies are not accessible normally due to some of the effects being unfinished.

Bug!	Each baby with an ID higher than 562 is unable to appear in-game.

The Binding of Isaac: Rebirth
Achievements Challenges Completion Marks Items Trinkets Characters Chapters Rooms Transformations Attributes Bosses Monsters Pickups Modes Curses Objects Seeds Effects Endings
Collection Item Pools Version History Modding Music