It Lives

It Lives is a boss that can appear on the second floor of Chapter 4 (Womb, Utero, Scarred Womb). It permanently replaces Mom's Heart after killing the latter 11 times. • Flooded Caves - Defeat It Lives! 16 times. • Dank Depths - Defeat It Lives! 21 times. • Scarred Womb - Defeat It Lives! 30 times. • Lost Baby - Defeat Mom's Heart on Hard mode as Isaac. • Cute Baby - Defeat Mom's Heart on Hard mode as Magdalene. • Glass Baby - Defeat Mom's Heart on Hard mode as Cain. • Shadow Baby - Defeat Mom's Heart on Hard mode as Judas. • Dead Baby - Defeat Mom's Heart on Hard mode as ???. • Crow Baby - Defeat Mom's Heart on Hard mode as Eve. • Fighting Baby - Defeat Mom's Heart on Hard mode as Samson. • Wrapped Baby - Defeat Mom's Heart on Hard mode as Azazel Defeat Mom's Heart on Hard mode as Lazarus. • Begotten Baby - Defeat Mom's Heart on Hard mode as Lazarus Defeat Mom's Heart on Hard mode as Azazel. • Glitch Baby - Defeat Mom's Heart on Hard mode as Eden. • -0- Baby - Defeat Mom's Heart on Hard mode as The Lost. • Goat Head Baby - Defeat Mom's Heart on Hard mode as Lilith. • Super Greed Baby - Defeat Mom's Heart on Hard mode as Keeper. • Smelter - Defeat Mom's Heart or It Lives! on Hard mode as Apollyon. • Marrow - Defeat Mom's Heart or It Lives! on Hard mode as The Forgotten. • Wisp Baby - Defeat Mom's Heart or It Lives! on Hard mode as Bethany. • Double Baby - Defeat Mom's Heart or It Lives! on Hard mode as Jacob and Esau.

• Just like Mom and Mom's Heart, using The Bible or XV - The Devil? against It Lives will kill it instantly.
• Isaac can encounter It Lives in the nightmare boss wave of chapter 4 in Greed/Greedier mode even if it has not been unlocked.

• It Lives appeared in the original The Binding of Isaac. Unlike its appearance in Rebirth, It Lives had opened eyes, a simple poker face, and hung to the ceiling in a sideways position via an umbilical cord.
• The music that plays during this fight is titled Ventricide.[1] Ventricide is a portmanteau formed from the word ventricle (chamber of the heart) and the suffix -cide, which denotes an act of killing. This theme is used in other tracks, such as Matricide, Hericide, and Infanticide.
• Ventricide could also be a junction of the prefix ventr- (from the latin word venter), which could denote "belly", "stomach", "womb" or "fetus", with the suffix -cide.
• It Lives shares this theme with Mom's Heart, and therefore, both interpretations could co-exist.
• It Lives, according to the developers, takes the shape of what Isaac looked like as a fetus.
• According to Edmund McMillen, It Lives supposedly represents Isaac wishing that he were never born.
• It Lives makes the same sounds as Mom's Heart.
• Like Mom's Heart, if Isaac takes damage from It Lives' Brimstone attack, Mom's laugh can be heard.
• Despite being a major boss, It Lives isn't linked to any Ending, instead, it opens up entrances to both Sheol and the Cathedral, as well as ??? if beaten in under 30 minutes.
• The unlock note for It Lives states "Your futures past awaits.", referencing Time Fcuk, another game by Edmund Mcmillen.
• During the versus screen, It Lives' enemy/boss-spawning sound can be heard. It Lives is one of seven/ five bosses that can be heard during the versus screen, the other six/ four being The Stain, The Forsaken, Big Horn, Mom, Mom's Heart and Mother.