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Utero

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Font TeamMeat U.pngFont TeamMeat t.pngFont TeamMeat e.pngFont TeamMeat r.pngFont TeamMeat o.png

Stage's starting room
(chapter 4)
Table dividing line 1.png
 
Normal and hard modes only 11
 
Normal and hard modes only 7a, 8a
Table dividing line 2.png
 
The Womb Defeat Mom for the 1st timeThe WombThe Womb

Utero is an alternate floor to The Womb The Womb. Unlike other alternate floors, Utero does not need to be unlocked, aside from unlocking The Womb. Its walls are slightly different, and the floor contains several of the same enemies. Like The Womb, all damage taken on this floor and onwards deducts a full heart from the player's health (unless the player is in possession of The Wafer The WaferThe Wafer Icon.pngAll sources of damage that would cause more than one half heart of damage are reduced to one half heart instead.), regardless of the source.

Monsters[edit | edit source]

Monster Description
Clotty
Clotty
Randomly wanders around the room, firing 4 blood shots in the cardinal directions.
Clot
Clot
Randomly wanders around the room, firing 4 tar shots in the ordinal directions.
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 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.
Baby
Baby
Slowly floats towards Isaac and fires blood shots. Occasionally teleports and reappears elsewhere.
Angelic Baby
Angelic Baby
Slowly floats towards Isaac and fires three spread 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.
Guts
Guts
Attaches itself to a wall or obstacle and rolls around it.
Vomit Grimace
Vomit Grimace
Stationary and invulnerable monster that occasionally fires an Ipecac shot at Isaac. Stops firing when room is cleared.
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.
Holy Leech
Holy Leech
Quickly charges towards Isaac when he gets in its line of sight. Explodes upon death. Spawns with an Eternal Fly circling it, which instantly dies when the Holy Leech explodes.
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.
Bloodshot Eye
Bloodshot Eye
Slowly turns towards Isaac and fires a Brimstone beam 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.
Spider
Spider
Erratically moves towards Isaac and deals touch damage.
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.
Big Spider
Big Spider
Erratically moves towards Isaac and deals touch damage. Splits into two Spiders upon death.
Stone Eye
Stone Eye
Stationary and invulnerable monster that constantly rotates and fires a flickering Technology laser. Stops firing when the room is cleared.
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.
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.
Gaping Maw
Gaping Maw
Stationary and invulnerable monster that sucks Isaac towards it, along with Isaac's tears and enemy projectiles.
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.
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 Teratoma.png
Boss The Fallen.png
Mama Gurdy Mr. Fred Teratoma The Fallen Requires previous entry into a devil room
Boss Conquest.png
Boss Death.png
Boss The Headless Horseman.png
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 The Cage.png
Boss The Fallen.png
Boss The Gate.png
(Double Trouble)
The Cage
(Double Trouble)
The Fallen
(Double Trouble)
The Gate
Boss Gurdy.png
Boss Loki.png
Boss Little Horn.png
(Double Trouble)
Gurdy
(Double Trouble)
Loki
(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

Unlockable Achievements[edit | edit source]

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

Music[edit | edit source]

  • The music for Utero is titled Viscera. The term “viscera” refers to the internal organs in the body. The Womb The Womb 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