Acid Baby is a familiar in The Binding of Isaac, added in the Afterbirth+ DLC.

Spawns a familiar that follows Isaac and drops a random pill after every 7 cleared rooms. The first pill is dropped after 6 rooms.

Upon using a pill, the familiar poisons all enemies in the room for 6 ticks. Each tick deals damage equal to Isaac's. Enemies also take 10 additional damage.

This page shows the latest information as of the new Repentance+ (Online Co-op) DLC.
To see information about this item for the previous Repentance version, check this page instead.

This item contributes towards the Conjoined transformation. Collecting 3 items from this set will make Isaac shoot in 3 directions at the cost of -0.3 damage and -0.3 tears.

Acid Baby can be found in the following item pools:

The following tags are applied to this item:

The following special synergies and interactions for Acid Baby have been documented.

* Note that not all possible synergies and interactions are listed here.

Below is the Internal Item Description as shown in-game.
Note that some stat changes are not displayed here. Please see the main description for the full effects.

Acid Baby

• Following familiar that drops a pill every 7 rooms
• Consuming a pill triggers Acid Baby to instantly damage all enemies in the current room and poison them for additional damage
• Abyss: x1 necrotic locust 1x Isaac's damage

• Check out the item description on the external Isaac Wiki.