Blue Baby

	3.5 (*1.05)
	+0
	1
	23.75
	1.1
	0
	None
	The PoopSpawns a pile of poop where the character is standing and knocks nearby monsters back. May yield pickups like regular poop.
Defeat Mom's Heart 10 times???

This article is about the playable character. For the boss at the end of The Chest, see ??? (boss). For the floor, see ??? (floor). For the pill effect, see Pills.

???, also known as the Blue Baby, is a character unlocked by defeating Mom's Heart ten times. He starts with three soul hearts, and his health meter is unique in that he cannot gain red heart containers. If an item would grant him a red heart container (including an empty one), it adds a soul heart instead.

Unlockable items

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  ???'s Only Friend - Complete the Boss Rush as ???.

• 

  Dead Baby - Defeat Mom's Heart on hard mode as ???.

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  Forget Me Now - Defeat Satan as ???.

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  The D6 - Defeat Isaac as ???.

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  ???'s Soul - Defeat The Lamb as ???.

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  Fate - Defeat ??? as ???.

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  Cracked Dice - Defeat Ultra Greed as ???.

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  Meconium - Defeat Ultra Greedier as ???.

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  Fate's Reward - Defeat Hush as ???.

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  Blue Baby - Defeat Mega Satan as ???.

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  King Baby - Defeat Delirium as ???.

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  Hive Baby - Earn all hard mode completion marks as ???.

Item & strategy notes

Positive

• AbaddonIncreases damage and speed, removes all red heart containers, grants six black hearts, and adds a chance to shoot fear tears. costs three Soul Hearts and grants six Black Hearts, damage up, fear shot, and no negative effects to ???. Abaddon can be bought safely regardless of current health, because its price can be deducted from the acquired Black Hearts retroactively.
• AnkhUpon death, the player will respawn as ??? with 3 soul hearts. is effectively a 1up!Gives an extra life. Upon death, you will respawn in the previous room with full health and lose the 1up!. for ???.
• AthameWhenever Isaac takes damage, a black ring briefly appears around Isaac, dealing damage to all nearby enemies. can be used to produce black hearts upon taking damage.
• Balls of Steel pills or V - The HierophantSpawns 2 soul hearts. grant two soul hearts, both of which are more useful than normal HP up items.
• The XI - StrengthGrants the effect of Magic Mushroom (increases all of Isaac's stats except tears), but adds one (temporary) heart container for the current room as opposed to a permanent one. card gives ??? a permanent soul heart.
• Book of RevelationsAdds 1 soul heart, increases the chance for a Devil or Angel Room to appear, and increases the chance for the next boss to be a Horseman (except on XL floors and floors with fixed bosses such as Mom). Spawns soul hearts.
• Ceremonial RobesAdds 3 black hearts and increases Damage by 1. costs three Soul Hearts and grants three Black Hearts and damage up. Like AbaddonIncreases damage and speed, removes all red heart containers, grants six black hearts, and adds a chance to shoot fear tears., this item is always safe to take.
• Crown of LightGives Isaac a crown that glows blue when active, and turns gray when inactive. While Isaac has no empty red heart containers, Isaac's tears are replaced with blue diamond tears that deal double damage. Regardless of health, the crown will deactivate for the current room when Isaac takes damage. will always activate.
• MitreGrants a chance of converting any red hearts pickups into soul hearts instead. and Daemon's TailMost non-specific heart drops become black hearts, but heart drops are significantly less common. replace useless Red Hearts with Soul and Black Hearts respectively.
• Dark BumSpawns a familiar that follows Isaac around and collects red hearts. For every one-and-a-half red hearts collected, Dark Bum will generate one soul heart, one hostile Spider or one friendly blue spider. converts useless Red Hearts into Soul Hearts and spiders.
• Dim BulbProvides a boost to all stats when Isaac's active item is completely uncharged. is able to be activated every room due to the single charge on The PoopSpawns a pile of poop where the character is standing and knocks nearby monsters back. May yield pickups like regular poop., providing a consistent stat boost.
• GimpyHas a chance of spawning a soul heart or black heart when taking damage. Enemies have a chance to drop a Half Red Heart after being killed. has a chance to spawn Soul Hearts when hit.
• Lazarus' RagsUpon dying, resurrect as Revived Lazarus with one heart container and Anemic item. causes ??? to be resurrected as Lazarus Risen when he dies, allowing the gathering of Heart Containers. Once this happens, however, you are no longer playing as ???, and therefore cannot get any of his achievements/unlocks. The same effect happens with the use of Judas' ShadowAdds an extra life; upon death, it respawns Isaac as Black Judas with only two black hearts..
• Maw of the Void+1.0 Damage Up. After continuously firing tears for 2.5 seconds, a red cross appears on Isaac's head that, upon releasing the fire button, creates a black ring that rapidly deals damage equal to Isaac's tear damage to any enemies in contact with it. can produce black hearts.
• Midas' TouchEnemies that touch you are stunned and turn gold. Any enemy killed while in this state will drop a coin. makes The PoopSpawns a pile of poop where the character is standing and knocks nearby monsters back. May yield pickups like regular poop. create golden poop.
• Monkey PawIf the character has half a heart after taking damage, it drops a black heart. The effect can trigger up to three times, after which the trinket will disappear. will drop 3 black hearts, but must take damage for each one to spawn.
• Petrified PoopGreatly increases the chances of a pickup dropping when destroying poop. is useful early on to get more pickups from The PoopSpawns a pile of poop where the character is standing and knocks nearby monsters back. May yield pickups like regular poop. every room.
• PyromaniacIsaac heals 1 heart instead of taking damage from an explosive source. Adds 5 bombs. makes ??? immune to all explosions.
• The PolaroidIf the character has half a red heart or no red hearts after taking damage, it triggers the Book of Shadows effect, creating a shield that nullifies all types of damage for 5 seconds. Also allows entrance into The Chest. and The NegativeIf the character has half a red heart or no red hearts after taking damage, it triggers The Necronomicon effect, damaging all enemies in the room. Also allows entrance into the Dark Room. always activate when taking damage.
• The RelicIsaac is followed by a small blue cross that will drop a Soul Heart every 4 rooms., which is generally useful, is especially useful to ??? as it spawns Soul Hearts.
• Satanic BibleUpon activation, Isaac gains a black heart. generates Black Hearts.
• Serpent's KissTears now have a random chance to apply a poison effect, causing 4 or 6 damage per tick to enemies (Similar to The Common Cold item). Isaac now deals poison damage on contact with enemies similar to The Virus item (Damage over time 4 or 6 per tick). Enemies that were poisoned have a chance to drop a black heart when killed. can produce black hearts by poisoning enemies.
• SqueezyIncreases tears by 0.4, and spawns 2 Soul Hearts pickups. and Mr. DollyTears and Range up. Spawns 3 random types of hearts on the floor when picked up. increase ???'s tears and can grant soul hearts.
• Whore of BabylonIncreases damage and speed whenever Isaac has half a red heart or less (one red heart for Eve), ignoring any soul or black hearts. is always active.

Negative

• Items that directly add Red Hearts to the health bar, such as Yum HeartRestores 1 whole red heart. or full health pills, are useless.
• Blood donation machines and Devil beggars are riskier, as they deplete health that is harder to replenish.
• If ??? has only one heart, Experimental TreatmentRandomly increases and decreases some of the character's stats. has a chance to be lethal.
• Cursed SkullIf Isaac has less than one full red heart after taking damage, he will be immediately teleported to the last cleared room he was in. will automatically teleport ??? out of the room upon taking any damage, as he doesn't have any Red Hearts.
• Dead CatSets the amount of red heart containers to 1, but gives Isaac 9 extra lives. After dying, Isaac is teleported to the last safe room. New heart containers can be obtained after picking up this item, but after each death, the number of heart containers is set to 1 again. will remove all but one Soul Hearts. However, it can be used as a last resort if you are running very low on Soul Hearts.
• Glass CannonWhen used, reduces Isaac's health to half a heart (including soul and black hearts) and fires one large piercing spectral tear that does a lot of damage. The damage done by Glass Cannon scales with Isaac's damage (at base damage it does 45 damage). will bring ??? down to half a soul heart, and not give back any health upon leaving a room due to ???'s lack of red hearts. This item essentially takes away most of the player's health in exchange for a single high damage tear.
• Guppy's PawRemoves one red heart container in exchange for gaining 3 Soul Hearts., since requiring red hearts to convert, would be a useless item to hold (but should still be picked up and swapped back to get credit towards the Guppy transformation). Guppy's Paw may still be used to activate Broken RemoteTriggers the Teleport effect whenever an activated item is used..
• Judas' TongueItems in the Devil Room only cost 1 heart. Soul heart trades still cost 3 soul hearts. doesn't lower the price of soul heart devil deals.
• Little C.H.A.D.A familiar who will drop a half red heart every 2 rooms. is useless unless paired with Dark BumSpawns a familiar that follows Isaac around and collects red hearts. For every one-and-a-half red hearts collected, Dark Bum will generate one soul heart, one hostile Spider or one friendly blue spider., where it becomes very useful.

Notes

• Sleeping on a bed will give ??? three soul hearts.
• Enemies who deal full hearts of damage can be very dangerous in the early floors of the game.
• The PoopSpawns a pile of poop where the character is standing and knocks nearby monsters back. May yield pickups like regular poop. - While not the most useful item, it can allow ??? to cross small gaps by bombing the poop from the opposite side, much like one would for Rocks. Furthermore, in rooms with non-flying enemies that chase the player (except spiders), the poop can be used in a corner of the room making ??? untouchable, allowing the player to kill them without taking damage (if the player moves away from the pile of poop generated, this will no longer work).
• Bone hearts grant an empty bone heart upon pickup, but they cannot be refilled using red hearts.

Trivia

•  ??? appears in the original Binding of Isaac.
  •  ???'s unlock requirements in Rebirth are the same in the original Binding of Isaac.
• The name "Blue Baby" had not appeared in the game itself until the Afterbirth expansion, with a co-op baby named as such.
•  ???'s common nickname, Blue Baby, is a reference to blue baby syndrome, in which a baby's skin complexion appears blue from a lack of oxygen in its blood due to a congenital heart defect.
• Many of Edmund's older flash games from Newgrounds feature ??? and Brother BobbyFollows Isaac around shooting normal tears.. ??? was Edmund's mascot from 1996-2002.
• In several cutscenes, Isaac is depicted suffocating inside a chest. ??? is first seen inside an identical chest, and is the follow up boss after Isaac. Blue skin tone is typically used to show suffocation, and X eyes imply that the character is either knocked out or deceased.
  • After death, the bowels of the deceased will loosen, causing them to defecate themselves. This is most likely the reason ??? starts with The PoopSpawns a pile of poop where the character is standing and knocks nearby monsters back. May yield pickups like regular poop..
• Unlike many of the other characters, ??? does not appear in the Bible or any religious scripture.
• The AnkhUpon death, the player will respawn as ??? with 3 soul hearts. will resurrect any character as ???, even before he is unlocked.
• Although "Blue Baby" is considered an unofficial nickname for ???, the character is referred to by this name in some of the game's code. One example of this is the image file for the character, named character_006_bluebaby.
•  ???'s look originally came from Dead Baby Dressup, one of Edmund McMillen's first Flash games.
• ???'s starting health is listed as "-1" on the character selection screen.

Gallery

• 

  ??? in ending 10.

Mom's Heart Unlocks
A NooseDefeat Mom's Heart 3 timesA QuarterDefeat Mom's Heart 8 timesA Fetus in a JarDefeat Mom's Heart 9 times???Defeat Mom's Heart 10 timesEverything Is Terrible!!!Defeat Mom's Heart 5 timesIt Lives!Defeat Mom's Heart 11 timesWire Coat HangerDefeat Mom's Heart 4 timesIpecacDefeat Mom's Heart 6 timesExperimental TreatmentDefeat Mom's Heart 7 timesRubber CementDefeat Mom's Heart 2 timesDarkness FallsDefeat Mom's Heart 11 timesSolar SystemDefeat Mom's Heart 3 timesSuicide KingDefeat Mom's Heart 11 timesDemo ManDefeat Mom's Heart 9 timesLost BabyDefeat Mom's Heart on hard mode as IsaacCute BabyDefeat Mom's Heart on hard mode as MagdaleneCrow BabyDefeat Mom's Heart on hard mode as EveShadow BabyDefeat Mom's Heart on hard mode as JudasGlass BabyDefeat Mom's Heart on hard mode as CainWrapped Baby Defeat Mom's Heart on hard mode as Azazel Defeat Mom's Heart on hard mode as LazarusBegotten Baby Defeat Mom's Heart on hard mode as Lazarus Defeat Mom's Heart on hard mode as AzazelDead BabyDefeat Mom's Heart on hard mode as ???-0- BabyDefeat Mom's Heart on hard mode as The LostGlitch BabyDefeat Mom's Heart on hard mode as EdenFighting BabyDefeat Mom's Heart on hard mode as Samson	Goat Head BabyDefeat Mom's Heart on hard mode as LilithBlue WombDefeat Mom's Heart 10 timesSuper Greed BabyDefeat Mom's Heart on hard mode as KeeperBlue BomberDestroy 10 tinted rocks and defeat Mom's Heart 11 times	Pokey MansDefeat Mom's Heart 11 timesSmelterDefeat Mom's Heart or It Lives! on hard mode as ApollyonBurning BasementDefeat Mom's Heart 11 timesMarrowDefeat Mom's Heart or It Lives! on hard mode as The Forgotten

Characters
Rebirth	Afterbirth	Afterbirth †