The Womb

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Stage's starting room
(chapter 4)
Table dividing line 1.png
 
Normal and hard modes only 10     Greed and Greedier modes only 22
 
Normal and hard modes only 7, 8     Greed and Greedier modes only 4
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The Womb Defeat Mom for the 1st timeThe WombThe Womb

The Womb is the fourth chapter of the game, unlocked after beating Mom. From the Womb onwards, all damage taken will do a full heart of damage to the player's health (unless the player has The Wafer), regardless of the source. Like The Depths The Depths / Necropolis Necropolis, the Womb's second floor has a preset boss that will always be fought: Mom's Heart initially, and It Lives after beating Mom's Heart 11 times.

The Womb has two alternate floors. The Utero, which, unlike alternate floors before it, does not need to be unlocked separately from the Womb, and the Scarred Womb Scarred Womb.

Monsters[edit | edit source]

Monster Description
Clotty
Clotty
Randomly wanders around the room, firing 4 blood shots in the cardinal directions.
I.Blob
I.Blob
Randomly wanders around the room, firing 8 shots in all directions.
Attack Fly
Attack Fly
Red fly that follows Isaac and deals touch damage.
Charger
Charger
Slowly moves around the room, charging at Isaac when he gets in its line of sight.
Globin
Globin
Chases Isaac, dealing a full heart of contact damage. Upon taking enough damage, it collapses into a pile of goo, which can be killed. Will regenerate after a short period of time if not killed quickly.
Gazing Globin
Gazing Globin
Quickly chases Isaac, dealing a full heart of contact damage. Upon taking enough damage, it collapses into a pile of goo, which will slide away from Isaac and can be killed. Will regenerate after a short period of time if not killed quickly.
Red Boom Fly
Red Boom Fly
Flies around the room diagonally, dealing touch damage and exploding into 6 blood shots upon death.
Maw
Maw
Slowly floats towards Isaac, firing blood shots when Isaac is in range of them.
Red Maw
Red Maw
Floats towards Isaac and explodes into 4 blood shots in the cardinal directions upon death.
Host
Host
Stationary enemy that is normally invulnerable. Raises its head up when Isaac gets close, revealing a fleshy stem that can be damaged. Upon raising its head, it will fire 3 blood shots and lower its head again.
Red Host
Red Host
Stationary enemy that can be damaged even when its head is lowered. Fire 5 spread blood shots when it raises its head.
Boil
Boil
Stationary enemy that decreases in size when hit, but regenerates to its full size until fully destroyed. Fires multiple short-ranged blood projectiles in random directions when fully swollen.
Brain
Brain
Slowly crawls around the room, leaving a trail of red creep.
Mr. Maw
Mr. Maw
Walks towards Isaac and attacks by launching its head towards Isaac. Turns into a Maw or Gusher upon death depending on the killed body segment.
Mr. Red Maw
Mr. Red Maw
Walks towards Isaac and attacks by launching its head towards Isaac. Turns into a Red Maw or Gusher upon death depending on the killed body segment. Occasionally separates at will.
Baby
Baby
Slowly floats towards Isaac and fires blood shots. Occasionally teleports and reappears elsewhere.
Vis
Vis
Randomly wanders around the room. Pauses to charge and fire a Brimstone laser when Isaac gets in its line of sight.
Double Vis
Double Vis
Randomly wanders around the room. Pauses to charge and fire a Brimstone laser which fires from both sides when Isaac gets in its line of sight.
Chubber
Chubber
Randomly wanders around the room. Pauses to fire a Charger that deals one heart of damage when Isaac gets in its line of sight. The Charger is invulnerable, blocks Isaac's tears, has limited range, and flies back to the Chubber.
Scarred Double Vis
Scarred Double Vis
Randomly wanders around the room. Pauses to charge and fire a Brimstone laser which fires from all four cardinal sides when Isaac gets in its line of sight.
Guts
Guts
Attaches itself to a wall or obstacle and rolls around it.
Scarred Guts
Scarred Guts
Attaches itself to a wall or obstacle and rolls around it, leaving a trail of damaging red creep.
Stone Grimace
Stone Grimace
Stationary and invulnerable monster that occasionally fires blood shots at Isaac. Stops firing when room is cleared.
Poky
Poky
Slides around the room aimlessly, damaging Isaac by contact. Disappears when the room is cleared.
Slide
Slide
Quickly slides towards Isaac when he gets in its line of sight, then moves slowly back to its original position. Cannot be destroyed.
Dople
Dople
Mirrors Isaac's movements and fires blood shots at the same time as Isaac. Can be damaged by spikes.
Leech
Leech
Quickly charges towards Isaac when he gets in its line of sight.
Lump
Lump
Fires 3 spread blood shots at Isaac when he gets in its line of sight. Will burrow underground and reappear elsewhere after firing.
MemBrain
MemBrain
Slowly moves around the room, occasionally hopping and firing 8 large blood shots in all directions. Splits into 2 Brains upon death.
Mama Guts
Mama Guts
Slowly moves around the room, occasionally hopping and firing 8 large blood shots in all directions. Splits into 2 Guts upon death.
Para-Bite
Para-Bite
Moves towards Isaac, dealing contact damage. Can burrow underground and reappear elsewhere.
Fred
Fred
Hops out of the ground and burrows elsewhere, firing 4 blood shots in the ordinal directions. Occasionally fires red Ipecac shots at Isaac.
Eye
Eye
Slowly turns towards Isaac and fires a laser at Isaac if he stands still or is too slow.
Sucker
Sucker
Flies slowly towards Isaac, exploding into 4 shots in the cardinal directions upon death.
Spit
Spit
Flies slowly towards Isaac, firing an Ipecac shot towards Isaac upon death.
Embryo
Embryo
Aimlessly hops around the room, dealing contact damage.
Moter
Moter
Follows Isaac, similar to Attack Flies. Splits into 2 Attack Flies upon death.
Walking Boil
Walking Boil
Does not shrink or regenerate. Walks around aimlessly and fires multiple short-ranged blood projectiles in random directions.
Mask + Heart
Mask + Heart
The Mask is invulnerable and moves around erratically, charging at Isaac when he lines up with it. The Heart avoids Isaac and fires 4 blood shots in the cardinal directions when Isaac gets near. Killing the Heart will automatically kill the Mask.
Stone Eye
Stone Eye
Stationary and invulnerable monster that constantly rotates and fires a flickering Technology laser. Stops firing when the room is cleared.
Constant Stone Shooter
Constant Stone Shooter
Stationary and invulnerable monster that continuously fires shots in a single direction.
Crazy Long Legs
Crazy Long Legs
Chases Isaac, dealing touch damage. Occasionally stops to spit blood shots in 8 directions.
Small Crazy Long Legs
Small Crazy Long Legs
Chases Isaac, dealing touch damage. Occasionally stops to spit blood shots diagonally in 4 directions.
Pale Fatty
Pale Fatty
Slowly walks towards Isaac. Occasionally farts and shoots blood shots in 6 directions. Can turn into a Blubber upon death.
Fat Sack
Fat Sack
Slowly walks towards Isaac. Occasionally leaps off-screen and attempts to land on Isaac, leaving a puddle of creep and shooting blood shots in 6 directions where it lands. Can turn into a Blubber upon death.
Blubber
Blubber
Walks around aimlessly and randomly spews blood around itself. Can turn into a Half Sack when killed.
Half Sack
Half Sack
Wanders around aimlessly and leaves a trail of red creep.
Death's Head
Death's Head
Invulnerable enemy that moves diagonally around the room, dealing contact damage. Dies when the room is cleared.
Mom's Hand
Mom's Hand
Falls from the ceiling. If it lands on Isaac, it deals damage and teleports the player back to the spawn room of the floor. Entering a room containing Mom's Hand will warn the player with Mom's laugh.
Swinger
Swinger
Slowly moves towards Isaac as its head swings around its base. Upon death, spawns a Maw or a Globin depending on which part is killed.
Dip
Dip
Slowly dashes in random directions, dealing contact damage.
Wall Hugger
Wall Hugger
Moves around the room like Guts, damaging Isaac by contact. Cannot be destroyed.
Squirt
Squirt
Dashes towards the player and deals contact damage. Spawns 2 Dips upon death.
Cod Worm
Cod Worm
Stationary enemy that hides in a shell and spews blood if shot at. Only vulnerable when it pops its head out.
Dinga
Dinga
Slowly moves around the room, occasionally hopping, spawning Dips or firing 8 brown shots in all directions. Spawns 2 Squirts on death.
Oob
Oob
When Isaac lines up with it horizontally, it charges across the room once. When Isaac is not horizontal to it, it spawns Brains.
Rotty
Rotty
Slowly walks towards Isaac, leaving short-lasting red creep behind itself. Spawns a Bony or two Attack Flies upon death.
Bony
Bony
Wanders around the room and throws a bone at Isaac when he is in sight.
Homunculus
Homunculus
Starts attached to the wall. After a while, it detaches, shooting 6 blood shots and chasing Isaac. If it dies while still attached to the wall, it leaves a puddle of creep.
Tumor
Tumor
Moves around the room diagonally, occasionally firing 6 shots. Fires more often upon getting damaged.
Nerve Ending
Nerve Ending
Static enemy which acts as a meat shield.
Nerve Ending 2
Nerve Ending 2
Static enemy which whips at Isaac if he gets too close.
Gaping Maw
Gaping Maw
Stationary and invulnerable monster that sucks Isaac towards it, along with Isaac's tears and enemy projectiles.
Broken Gaping Maw
Broken Gaping Maw
Stationary and invulnerable monster that sucks Isaac towards it, along with Isaac's tears and enemy projectiles. Alternates between active and inactive every couple of seconds.
Grub
Grub
Erratically moves around the room like Larry Jr. and charges at Isaac when he gets within its line of sight. Spawns Maggots, Chargers, or Spitties upon death, one for each of its segments.
Wall Creep
Wall Creep
Crawls along walls to try to line up with Isaac and shoots three blood shots in a line.
Rage Creep
Rage Creep
Slowly crawls along walls to try to line up with Isaac and shoots a Brimstone laser.
Blind Creep
Blind Creep
Randomly crawls along walls and shoots three spread blood shots.
Round Worm
Round Worm
Pops out of the ground in random locations and spits a blood shot at Isaac if he is in sight.
Flesh Mobile Host
Flesh Mobile Host
Acts like the Red Host, but follows Isaac and deals contact damage.
Full Fly
Full Fly
Flies toward Isaac erratically, dealing touch damage. Splits into 6 directional shots upon death.
Mega Clotty
Mega Clotty
Slowly moves around the room, occasionally hopping and firing 6 blood shots in all directions. Splits into two Clotties upon death.
Red Ghost
Red Ghost
Disappears, then reappears near Isaac and fires a brimstone laser.
Flesh Death's Head
Flesh Death's Head
Moves diagonally around the room, dealing contact damage. Explodes into 6 blood shots in all directions upon death. Can be killed, but also dies when the room is cleared.
Mom's Dead Hand
Mom's Dead Hand
Falls from the ceiling. If it lands on Isaac, it deals damage and teleports the player back to the spawn room of the floor. If it doesn't land on Isaac, it spawns several rock waves that travel outwards. Spawns several spiders upon death. Entering a room containing Mom's Dead Hand will warn the player with Mom's laugh.
Dukie
Dukie
Flies around the room diagonally, occasionally spitting out a Dart Fly.
Ulcer
Ulcer
Pops out of the ground in random locations and spawns a Dart Fly if Isaac is in sight. Fires a blood shot after spawning 6 Dart Flies.
Meatball
Meatball
Slides around the room, occasionally stopping to spew a fountain of short-range blood shots in all directions or to spit a line of damaging red creep. Spawns a Host upon death.
Poison Mind
Poison Mind
Slowly crawls around the room diagonally, leaving a trail of green creep.
Portal
Portal
Spawns various enemies from the current floor until it either vanishes or is killed.
Fistuloid
Fistuloid
Flies towards Isaac in an erratic waving motion, periodically firing a blood shot towards Isaac that also knocks itself back. Upon death, fires a worm that flies off screen.
Degraded Bosses

Bosses[edit | edit source]

Boss Blastocyst.png
Boss The Bloat.png
Boss Daddy Long Legs.png
Boss Lokii.png
Blastocyst The Bloat Daddy Long Legs Lokii
Boss Mama Gurdy.png
Boss Mr. Fred.png
Boss Scolex.png
Boss Teratoma.png
Mama Gurdy Mr. Fred Scolex Teratoma
Boss The Fallen.png
Boss Conquest.png
Boss Death.png
Boss The Headless Horseman.png
The Fallen Requires previous entry into a devil room Conquest Needs to be unlocked Death Needs to be unlocked The Headless Horseman Needs to be unlocked
Boss Triachnid.png
Boss The Matriarch.png
Boss Sisters Vis.png
Triachnid Needs to be unlocked The Matriarch Added in Afterbirth † Needs to be unlocked Sisters Vis Added in Afterbirth † Needs to be unlocked

Double Trouble[edit | edit source]

Double Trouble Bosses
Boss Dingle.png
Boss The Cage.png
Boss The Fallen.png
Boss The Gate.png
(Double Trouble)
Dingle
(Double Trouble)
The Cage
(Double Trouble)
The Fallen
(Double Trouble)
The Gate
Boss Gurdy.png
Boss Dangle.png
Boss Little Horn.png
(Double Trouble)
Gurdy
(Double Trouble)
Dangle Added in  Afterbirth Needs to be unlocked
(Double Trouble)
Little Horn Added in  Afterbirth Needs to be unlocked

Final Boss[edit | edit source]

Mom's Heart will always appear in the second floor of this chapter or in the last boss room if Curse of the Labyrinth is active. Once It Lives is unlocked, it will appear instead of Mom's Heart.

Boss Mom's Heart.png
Boss It Lives.png
Mom's Heart It Lives Needs to be unlocked

Notes[edit | edit source]

  • It is possible to access the Womb before unlocking it by using a Ehwaz EhwazEhwaz Icon.pngCreates a trapdoor leading to the next floor. Has an estimated 1/12 (8%) chance to spawn a door to a Crawl Space instead. or We Need to Go Deeper! We Need to Go Deeper!We Need to Go Deeper! Rebirth Icon.png6 roomsCreates a trapdoor to go to the next floor. If used in The Womb, it will create a trapdoor to Sheol, even if the player hasn't unlocked it. on The Depths II.
  • Using the Rune of Ehwaz or We Need to Go Deeper on Womb/Utero II will lead the player to Sheol, which will skip any of Mom's Heart's endings.
  • The Womb being mentioned in Isaac's last will as a "warm place" is a reference to how the inner human body temperature is quite high.
  • The Womb and Utero Utero both have a slight static filter covering the screen, possibly to represent heat.

Unlockable Achievements[edit | edit source]

  • Mama's Boy
    Mama's Boy - Beat chapter 4 without taking damage.

Music[edit | edit source]

  • The music for the womb is titled Viscera. The term viscera represents the internal organs in the body. The Utero Utero shares this same track.
  • The music heard during the fight against Mom's Heart/It Lives is called Ventricide. Ventricide is a word made up of the Latin word for Heart, Ventricle, and the suffix -cide, which denotes the act of killing.
    • This has been confirmed by Edmund when he said it means something like "the killing of the heart". This is in theme with other similar boss tracks such as Matricide, Hericide, and Infanticide.

Binding of Isaac: Rebirth OST


Mom  Unlocks Mom Unlocks Mom  Unlocks
Added in  Afterbirth Added in Afterbirth †
The WombThe WombDefeat Mom for the 1st timeThe HarbingersThe HarbingersDefeat Mom for the 1st timeA Cube of MeatA Cube of MeatDefeat Mom for the 1st timeA HaloA HaloDefeat Mom using The BiblePuristPuristDefeat Mom for the first time XXXXXXXXLXXXXXXXXLDefeat Mom for the 1st timeSPEED!SPEED!Defeat Mom for the 1st timeHave a HeartHave a HeartDefeat Mom for the 1st timePRIDE DAY!PRIDE DAY!Defeat Mom for the 1st timeOnan's StreakOnan's StreakDefeat Mom for the 1st timeThe GuardianThe GuardianDefeat Mom for the 1st time Aprils foolAprils foolDefeat Mom for the 1st time
SmallIsaac.pngChaptersSmallIsaac.png
Chapter 1 Chapter 2 Chapter 3 Chapter 4 Optional Chapter 5 Chapter 6 Endgame
Normal mode only
Hard mode only
Stage The Basement icon.png Stage The Caves icon.png Stage The Depths icon.png Stage The Womb icon.png Stage Sheol icon.png
Sheol


Stage Cathedral icon.png
Cathedral
Stage Dark Room icon.png
Dark Room


Stage The Chest icon.png
The Chest
The Basement The Caves The Depths The Womb
Added in  Afterbirth Added in Afterbirth †
Stage The Cellar icon.png Stage The Catacombs icon.png Stage Necropolis icon.png Stage Utero icon.png ??? Stage The Void icon.png
The Cellar The Catacombs Necropolis Utero ??? The Void
Added in  Afterbirth Added in  Afterbirth Added in  Afterbirth Added in  Afterbirth
Stage Burning Basement icon.png Stage Flooded Caves icon.png Stage Dank Depths icon.png Stage Scarred Womb icon.png
Burning Basement Flooded Caves Dank Depths Scarred Womb
Added in  Afterbirth Greed mode only
Added in Afterbirth † Greedier mode only
Added in  Afterbirth Added in  Afterbirth
Stage The Basement icon.png Stage The Caves icon.png Stage The Depths icon.png Stage The Womb icon.png Stage Sheol icon.png The Shop Ultra Greed
The Basement The Caves The Depths The Womb Sheol The Shop Ultra Greed
The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth
Achievements Achievements Attributes Attributes Bosses Bosses TarotCard.png Cards and Runes Challenges Challenges Chapters Chapters
Characters Characters MainPageBabies.png Co-op Items Items Item Pools Item Pools Monsters Monsters Objects Objects
Pickups Pickups Pills Pills Rooms Rooms Seeds Seeds Transformations Transformations Trinkets Trinkets