Acid Baby
ItemAfterbirth+Unlocked
familiarGame ID 491★★★★
How do you unlock Acid Baby?
Verified starting unlockSource data confirms that no unlock is required.
Spawns a familiar that drops a random pill every [Before Repentance] 3 / [Repentance] 7 rooms. Upon using a pill, all enemies in the room are poisoned.
Available from the start
No unlock needed — this is available in every new save file.
What unlocking Acid Baby leads to
Nothing depends on this yet.
Source: bindingofisaacrebirth.wiki.gg
Imported 2026-09-13