Baby

Babies are monsters encountered in and.

Babies slowly float towards Isaac, occasionally shooting a single blood shot. They can also teleport to anywhere in the room, occasionally close to Isaac. They usually teleport after a shot, the only random element is the shooting, and they have no specific cue to indicate incoming attacks.

Angelic Baby
The Angelic Baby will sometimes replace the regular Baby. They can be found primarily in the Cathedral.

Instead of firing one shot, the Angelic Baby fires 3 blood shots at Isaac in a spread. They also teleport more often, usually near Isaac.

Small Angelic Baby
Smaller versions of the Angelic Baby that act the same, but with less health and shoots only one blood shot instead of three.

They are exclusively spawned by Holy Mulligans.

Wrinkly Baby
The Wrinkly Baby is a monster added in The Binding of Isaac: Repentance. It lunges towards Isaac at high speed and fires three blood shots in his direction once stopped.

Imp
Imps slowly float towards Isaac, occasionally firing 5 blood shots at Isaac in quick succession. They also randomly teleport around the room. Imps can sometimes appear behind the statue in the Devil Room, which may catch players off guard. Like Fat Bats, they try to avoid Isaac's shots, making it difficult to hit them sometimes.

Baby Begotten
The Baby Begotten is a monster added in The Binding of Isaac: Repentance, with an appearance similar to a Begotten. The Baby Begotten floats toward Isaac, attempting to avoid Isaac's shots as it approaches. After getting close to him, it lines itself up with him in the closest cardinal direction and fires a short-range laser at him, propelling itself in the opposite direction.

Unborn
Unborn fly towards Isaac in a circular pattern, and will periodically teleport near Isaac on another side of him.