Baby Plum

Baby Plum is a boss added in The Binding of Isaac: Repentance that can appear in all environments of Chapter 1.

Behavior
Baby Plum floats slowly towards Isaac and performs the following attacks:
 * Spits a diagonal stream of projectiles, propelling herself backwards across the room and bouncing off any walls she collides into.
 * Scattered in the stream are random larger projectiles that deal a whole heart of damage.
 * Baby Plum takes increased knockback from any source during this attack.
 * Twirls towards Isaac, sending out a spiral of projectiles.
 * Slams the ground, firing two rings of projectiles outwards and leaving behind a small pool of Red Creep. The inner ring consists of 14 slow-moving projectiles while the outer one consists of 8 fast-moving projectiles.
 * Upon death, releases a ring of 10 projectiles.

If Isaac goes a duration without hurting Baby Plum, she waves at the screen then flies away and leaves behind on the Boss Room pedestal if Isaac does not already have Plum Flute.
 * This does not apply in Greed mode, or any rooms she appears in that are not actually her own boss room.

Trivia

 * She is the boss version of a Red Boom Fly. Upon death, Baby Plum fires a ring of 10 blood shots, similar to the 6 shots fired from Red Boom Flies.
 * So far, Baby Plum is the only boss from Repentance to be added as one of Delirium's forms.
 * There is an unused animation file next to Baby Plum's called "Derpy Plum" that has no associated sprites.
 * Baby Plum is one of only 2 bosses that can be spared, with the other being Bumbino.