Rotten Baby is a familiar in The Binding of Isaac.

Spawns a familiar that follows Isaac and spawns friendly Blue Flies when in a room with enemies and holding down a fire button.

The familiar can spawn only one Blue Fly at a time. No additional Blue Flies will be spawned until the first one is killed (minimum delay of 1.36 seconds).

Can drop from destroying polyps in Corpse.

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.

Rotten Baby can be found in the following item pools:

The following tags are applied to this item:

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.

Rotten Baby

• Following familiar that generates blue flies
• Abyss: x1 locust 1.5x Isaac's damage

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