Binding of Isaac: Rebirth Wiki
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The Womb is the fourth chapter of the game, unlocked after beating Boss Mom ingameMom. From the Womb onwards, all damage taken will do a full heart of damage to the player's health (unless the player has Collectible The Wafer iconThe Wafer), regardless of the source. Like the DepthsDepths/NecropolisNecropolis/(except in Rebirth)Dank DepthsDank Depths, the Womb's second floor has a preset boss that will always be fought: Boss Mom's Heart ingameMom's Heart initially, and Boss It Lives ingameIt Lives after beating Mom's Heart 11 times.

The Womb has two alternate floors. The UteroUtero, which, unlike alternate floors before it, does not need to be unlocked separately from the Womb and the (except in Rebirth)Scarred WombScarred Womb.

Starting from this chapter onwards, floors do not naturally generate item rooms or shops.

Monsters[ | ]

Entity ID Description
Baby
Baby
38.0 Slowly floats towards Isaac and fires a blood shot at him. Occasionally teleports and reappears elsewhere.
Boil
Boil
30.0 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.
Walking Boil
Walking Boil
88.0 Does not shrink or regenerate. Walks around aimlessly and fires multiple short-ranged blood projectiles in random directions.
Bony
Bony
227.0 Wanders around the room and throws a bone at Isaac when he is in sight.
Death's Head
Death's Head
212.0 Invulnerable enemy that moves diagonally around the room, dealing contact damage. Dies when the room is cleared.
Brain
Brain
32.0 Slowly crawls around the room, leaving a trail of Red Creep.
MemBrain
MemBrain
57.0 Slowly moves around the room, occasionally hopping and firing 8 large blood shots in all directions. Splits into 2 BrainBrains upon death.
Charger
Charger
23.0 Slowly moves around the room, charging at Isaac when he gets in its line of sight.
Clotty
Clotty
15.0 Randomly wanders around the room, firing 4 blood shots in the cardinal directions.
I.Blob
I
15.2 Randomly wanders around the room, firing 8 shots in all directions.
Dip
Dip
217.0 Slowly dashes in random directions, dealing contact damage.
Squirt
Squirt
220.0 Dashes towards Isaac and deals contact damage. Spawns 2 Dips upon death.
Dinga
Dinga
223.0 Slowly moves around the room, occasionally hopping to spawn DipDips or fire 8 Brown shots in all directions. Splits 2 SquirtSquirts upon death.
Dople
Dople
53.0 Mirrors Isaac's movements and fires blood shots at the same time as Isaac. Can be damaged by spikes.
Embryo
Embryo
77.0 Aimlessly hops around the room, dealing contact damage.
Eye
Eye
60.0 Slowly turns towards Isaac and fires a Technology laser at Isaac if he stands still or is too slow.
Pale Fatty
Pale Fatty
208.1 Slowly walks towards Isaac. Occasionally farts and shoots 6 blood shots in all directions. Has a chance to turn into a Blubber upon death.
Fat Sack
Fat Sack
209.0 Slowly walks towards Isaac. Occasionally leaps off-screen and attempts to land on Isaac, leaving a puddle of Red Creep and shooting 6 blood shots in all directions where it lands. Has a chance to turn into a Blubber upon death.
Blubber
Blubber
210.0 Walks around aimlessly and randomly spews a cluster of blood shots in all directions. Has a chance to turn into a Half Sack when killed.
Half Sack
Half Sack
211.0 Wanders around aimlessly and leaves a trail of Red Creep.
Fly
Fly
13.0 Hovers in place. Does not deal contact damage and is harmless, but can turn into PooterPooters if they stay around PoopPoop.
Attack Fly
Attack Fly
18.0 Red fly that follows Isaac and deals contact damage.
Eternal Fly
Eternal Fly
96.0 Invulnerable fly that circles Corny PoopCorny Poop and various monsters. Deals contact damage. Turns into a vulnerable Attack FlyAttack Fly after the object or monster it circles is destroyed.
Moter
Moter
80.0 Follows Isaac, similar to Attack FlyAttack Flies. Deals contact damage. Splits into 2 Attack Flies upon death.
Pooter
Pooter
14.0 Slowly drifts toward Isaac, occasionally firing a single blood shot at him. Does not deal contact damage.
Full Fly
Full Fly
249.0 Flies toward Isaac erratically, dealing contact damage. Releases 6 bullets in all directions upon death.
Red Boom Fly
Red Boom Fly
25.1 Flies across the room in straight diagonal lines, dealing contact damage. Creates a ring of 6 blood shots upon death.
Sucker
Sucker
61.0 Flies slowly towards Isaac, exploding into 4 shots in the cardinal directions upon death.
Spit
Spit
61.1 Flies slowly towards Isaac, firing an Collectible Ipecac iconIpecac shot towards Isaac upon death.
Fred
Fred
59.0 Hops out of the ground and burrows elsewhere, firing 4 blood shots in the cardinal directions. Occasionally fires red Ipecac shots at Isaac.
Globin
Globin
24.0 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
24.1 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.
Grub
Grub
239.0 Erratically moves around the room like Boss Larry Jr. ingameLarry Jr. and charges at Isaac when he gets within its line of sight. Spawns MaggotMaggots, ChargerChargers, or SpittySpitties upon death, one for each of its segments.
Gurgling
Gurgling
237.0 Charges towards Isaac when he lines up with them, leaving a trail of Red Creep and shooting 6 blood shots.
Guts
Guts
40.0 Attaches itself to a wall or obstacle and rolls around it.
Mama Guts
Mama Guts
57.1 Slowly moves around the room, occasionally hopping and firing 8 large blood shots in all directions. Splits into 2 GutsGuts upon death.
Homunculus
Homunculus
228.0 Starts attached to the wall or an (in Afterbirth † and Repentance) obstacle. After a while, it detaches, shooting 6 blood shots in all directions, leaving a puddle of Red Creep and chasing Isaac. If it dies while still attached, it will still leave a puddle of Red Creep.
Host
Host
27.0 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 in a spread and lower its head again.
Red Host
Red Host
27.1 Stationary enemy that can be damaged even when its head is lowered. Fire 5 spread blood shots when it raises its head.
Flesh Mobile Host
Flesh Mobile Host
247.0 Acts like the Red Host, but follows Isaac and deals contact damage.
Leech
Leech
55.0 Quickly charges towards Isaac when he gets in its line of sight.
Pacer
Pacer
11.1 Walks aimlessly around the room.
Lump
Lump
56.0 Fires 3 spread blood shots at Isaac when he gets in its line of sight. Will burrow underground and reappear elsewhere after firing.
Maw
Maw
26.0 Slowly floats towards Isaac, firing a blood shot at him when he is in their range.
Red Maw
Red Maw
26.1 Floats quickly towards Isaac and releases 4 blood shots in the cardinal directions upon death.
Mr. Maw
Mr
35.0 Walks towards Isaac and attacks by launching its head towards him. Turns into a MawMaw or GusherGusher upon death depending on the killed body segment. Occasionally separates at will.
Swinger
Swinger
216.0 Slowly moves towards Isaac as its head swings around its base. Upon death, spawns a MawMaw or a GlobinGlobin depending on which part is killed.
Mom's Hand
Mom's Hand
213.0 Falls from the ceiling. If it lands on Isaac, it deals damage and teleports him back to the spawn room of the floor. Entering a room containing Mom's Hand will warn Isaac with Mom's laugh.
Nerve Ending
Nerve Ending
231.0 Static enemy which acts as a meat shield.
Oob
Oob
224.0 When Isaac lines up with it horizontally, it charges across the room once. When Isaac is not horizontal to it, it spawns Brains.
Round Worm
Round Worm
244.0 Pops out of the ground in random locations and spits a blood shot at Isaac if he is in sight.
Para-Bite
Para-Bite
58.0 Moves towards Isaac, dealing contact damage. Can burrow underground and reappear elsewhere.
Cod Worm
Cod Worm
221.0 Stationary enemy that hides in a shell and spews a burst of blood shots if shot at. Only vulnerable when it pops its head out.
Skinny
Skinny
226.0 Slowly walks towards Isaac, leaving short-lasting Red Creep behind itself.
Rotty
Rotty
226.1 Slowly walks towards Isaac, leaving short-lasting Red Creep behind itself. Spawns a BonyBony or two Attack FlyAttack Flies upon death.
Spider
Spider
85.0 Erratically moves around the room. If Isaac gets close to it, it chases him, trying to deal contact damage.
Crazy Long Legs
Crazy Long Legs
207.0 Chases Isaac, dealing touch damage. Occasionally stops to spit 8 blood shots in all directions.
Small Crazy Long Legs
Small Crazy Long Legs
207.1 Chases Isaac, dealing touch damage. Occasionally stops to spit 4 blood shots in the diagonal directions.
Wall Creep
Wall Creep
240.0 Crawls along walls to try to line up with Isaac and shoots three blood shots in a line.
Blind Creep
Blind Creep
242.0 Randomly crawls along walls and shoots three spread blood shots.
Rage Creep
Rage Creep
241.0 Slowly crawls along walls to try to line up with Isaac and shoots a Brimstone laser.
Tumor
Tumor
229.0 Moves around the room diagonally, occasionally firing 6 blood shots in all directions. Fires more often upon getting damaged.
Vis
Vis
39.0 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
39.1 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
39.2 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.
Mask + Heart
Mask + Heart
93.0 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.
Poky
Poky
44.0 Slides around the room aimlessly, damaging Isaac by contact. Disappears when the room is cleared.
Slide
Slide
44.1 Quickly slides towards Isaac when he gets in its line of sight, then moves slowly back to its original position. Cannot be destroyed.
Wall Hugger
Wall Hugger
218.0 Moves around the room like Guts, damaging Isaac by contact. Cannot be destroyed.
Stone Grimace
Stone Grimace
42.0 Stationary and invulnerable monster that occasionally fires a blood shot at Isaac. Stops firing when room is cleared.
Constant Stone Shooter
Constant Stone Shooter
202.0 Stationary and invulnerable monster that continuously fires shots in a single direction.
Gaping Maw
Gaping Maw
235.0 Stationary and invulnerable monster that sucks Isaac towards it, along with Isaac's tears and enemy projectiles.
Broken Gaping Maw
Broken Gaping Maw
236.0 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. Has a stronger attraction power than a regular Gaping Maw.
Stone Eye
Stone Eye
201.0 Stationary and invulnerable monster that constantly rotates and fires a flickering Technology laser. Stops firing when the room is cleared.
Flesh Death's Head
Flesh Death's Head
(except in Rebirth)
286.0 Moves diagonally around the room, dealing contact damage. Releases 6 blood shots in all directions upon death. Can be killed, but also dies when the room is cleared.
Mega Clotty
Mega Clotty
(except in Rebirth)
282.0 Slowly moves around the room, occasionally hopping and either firing 6 blood shots in all directions, leaving a puddle of Red Creep, or spawning a ClottyClotty or a collapsed GlobinGlobin. Splits into two ClottyClotties upon death.
Dukie
Dukie
(except in Rebirth)
288.0 Flies around the room diagonally, occasionally spitting out 1-2 Dart FlyDart Flies.
Scarred Guts
Scarred Guts
(except in Rebirth)
40.1 Attaches itself to a wall or obstacle and rolls around it, leaving a trail of damaging Red Creep.
Meatball
Meatball
(except in Rebirth)
290.0 Slides around the room. If Isaac is in sight, it will stop to spew a fountain of short-range blood shots in all directions or to spit a line of damaging Red Creep towards Isaac. Spawns a Host upon death.
Mom's Dead Hand
Mom's Dead Hand
(except in Rebirth)
287.0 Falls from the ceiling. Upon landing, it spawns several rock waves that travel outwards. Spawns several spiders upon death. Entering a room containing Mom's Dead Hand will warn Isaac with Mom's laugh.
Red Ghost
Red Ghost
(except in Rebirth)
285.0 Disappears, then reappears near Isaac and fires a brimstone laser.
Ulcer
Ulcer
(except in Rebirth)
289.0 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.
Scarred Double Vis
Scarred Double Vis
(except in Rebirth)
39.3 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.
Suction Pitfall
Suction Pitfall
(except in Rebirth)
291.1 Invulnerable and stationary enemy which sucks Isaac towards itself. Isaac falls into it when walked over, taking damage and popping back out after a short delay.
Poison Mind
Poison Mind
(in Afterbirth † and Repentance)
301.0 Slowly (except in Repentance)crawls/(in Repentance)floats around the room diagonally, leaving a trail of damaging green creep. (in Repentance) Explodes upon death.
Fistuloid
Fistuloid
(in Afterbirth † and Repentance)
308.0 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.
Mr. Red Maw
Mr
(in Afterbirth † and Repentance)
35.2 Walks towards Isaac and attacks by launching its head towards him. Turns into a Red MawRed Maw or Gusher upon death depending on the killed body segment. Occasionally separates at will.
Stoney
Stoney
(in Afterbirth † and Repentance)
302.0 Chases Isaac and blocks tears, but does not deal contact damage. Temporarily pauses in exhaustion after a certain amount of time. Invulnerable; dies when the room is cleared.
Cross Stone Shooter
Cross Stone Shooter
(in Afterbirth † and Repentance)
202.10 Stationary and invulnerable monster that continuously fires shots in four directions, alternating between cardinal and ordinal.
Nerve Ending 2
Nerve Ending 2
(in Afterbirth † and Repentance)
231.1 Static enemy which whips at Isaac if he gets too close.
Portal
Portal
(in Afterbirth †)
306.0 Spawns various enemies from the current floor until it either vanishes or is killed.
Needle
Needle
(in Repentance)
881.0 Pops out of the ground and lunges towards Isaac, dealing contact damage.
Triple Grimace
Triple Grimace
(in Repentance)
42.2 Stationary and invulnerable monster that occasionally fires a triple shot at Isaac. Stops firing when room is cleared.

Degraded Bosses:

Name ID Notes
Blastocyst
Blastocyst
74.0 Small- and medium- form only
Chub
Chub
28.0
Dingle
Dingle
261.0
The Duke of Flies
The Duke of Flies
67.0
Envy
Envy
51.0
Fistula
Fistula
71.0 Appears in all forms
Gemini
Gemini
79.0
Gluttony
Gluttony
49.0
Gurdy Jr.
Gurdy Jr.
99.0
Gurglings
Gurglings
237.1
The Haunt
The Haunt
260.0
The Hollow
The Hollow
19.1
Larry Jr.
Larry Jr.
19.0
Loki
Loki
69.0
Lust
Lust
47.0
Mega Fatty
Mega Fatty
264.0
Mega Maw
Mega Maw
262.0
Monstro
Monstro
20.0
Peep
Peep
68.0
Pin
Pin
62.0
Polycephalus
Polycephalus
269.0
Sloth
Sloth
46.0
Wrath
Wrath
48.0

Bosses[ | ]

Boss Blastocyst
Boss Lokii
Boss Mama Gurdy
Boss Mr. Fred
Blastocyst Lokii Mama Gurdy Mr. Fred
Boss Scolex
Boss The Bloat
Boss Daddy Long Legs
Boss Triachnid
Scolex The Bloat (except in Repentance) Daddy Long Legs (except in Repentance) Triachnid (except in Repentance) Needs to be unlocked
Boss Teratoma
Boss Death
Boss Conquest
Boss The Fallen
Teratoma (except in Repentance) Death Needs to be unlocked Conquest Needs to be unlocked The Fallen Devil Room Icon
Boss Headless Horseman
Boss The Matriarch
Boss Sisters Vis
Headless Horseman Needs to be unlocked The Matriarch (in Afterbirth † and Repentance) Needs to be unlocked Sisters Vis (in Afterbirth †) Needs to be unlocked

Double Trouble[ | ]

Double Trouble Bosses
Boss Dingle
Boss The Cage
Boss The Fallen
Boss The Gate
(Double Trouble)
Dingle
(Double Trouble)
The Cage
(Double Trouble)
The Fallen
(Double Trouble)
The Gate
Boss Gurdy
Boss Dangle
Boss Little Horn
(Double Trouble)
Gurdy
(Double Trouble)
Dangle (except in Rebirth) Needs to be unlocked
(Double Trouble)
Little Horn (except in Rebirth) Needs to be unlocked

Final Boss[ | ]

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

Notes[ | ]

  • It is possible to access the Womb before unlocking it by using a Rune of EhwazRune of Ehwaz or Collectible We Need To Go Deeper! iconWe Need To Go Deeper! on The Depths II.
  • Using the Rune of Ehwaz or We Need To Go Deeper on Womb/Utero II will lead the player to SheolSheol, which will skip any of Mom's Heart's endings.
  • Since shops no longer spawn in the Womb, it may be advisable to donate Isaac's remaining coins to the Donation Machine in the shop on Depths II.
  • Beggars still have a chance to spawn in Secret Rooms or can be spawned with XX - JudgementXX - Judgement, so some coins should be saved if you want to donate them to a Beggar.

Unlockable Achievements[ | ]

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

Trivia[ | ]

  • 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 has a slight static filter covering the screen, possibly to represent heat.
    • (except in Repentance) The UteroUtero shares this same static filter.
  • In the original Binding of Isaac, Boss Lokii ingameLokii and Boss Teratoma ingameTeratoma were exclusive to the Utero.
    • (in Repentance) Teratoma was moved back to the Utero.

Music[ | ]

  • The music for the Womb is titled Viscera.[1]
    • The term viscera represents the internal organs in the body.
    • (except in Repentance) The UteroUtero shares this same track.
  • The music heard during the fight against Mom's Heart/It Lives is called Ventricide. Ventricide combines ventricle, a word that means a hollow area in an organ and is often associated with the heart, and the suffix -cide, which denotes the act of killing.

References[ | ]


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