Dr. Fetus

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Character appearance
Tear appearance
Treasure Room Treasure Room  
Added in Afterbirth Afterbirth

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A Fetus in a Jar Defeat Mom's Heart 9 times

Dr. Fetus is a Special unlockable passive item.


  • Tears are replaced with bombs that explode approximately one second after being fired.
    • Removed in Afterbirth Each bomb deals 3 times the character's normal tear damage.
    • Added in Afterbirth Each bomb deals 5 times the character's normal tear damage plus a flat 30 damage. The flat 30 is not affected by damage multipliers.


  • Dr. Fetus overrides multiple tear effect items but benefit from some (but not all) bomb-enhancing effects like Mr. Mega Mr. Mega.
    • Added in Afterbirth In Afterbirth, many more synergies have been added.
  • With Dr. Fetus, the range and shot speed stats both affect the velocity at which the bombs are fired out. Delay before explosion is not affected by either.
  • Dr. Fetus is one of the items that directly affect tear delay.


  • 20/20 20/20: Shoots 2 bombs instead of 1 without decreased fire rate.
  • Blood Clot Blood Clot: Bonus damage applies on every shot. Also turns bombs red.
  • Bob's Bladder Bob's Bladder: Creep is left along the path that the bomb travels.
  • Bobby-Bomb Bobby-Bomb: Bombs slowly home in on enemies.
  • Afterbirth-exclusive content Bomber Boy Bomber Boy: Bombs explode in a large cross pattern.
  • Butt Bombs Butt Bombs: Bombs confuse enemies, and deal minor damage to the entire room, regardless of impact.
  • Chocolate Milk Chocolate Milk: Slightly increases fire rate; no effect on damage.
  • Added in Afterbirth Cricket's Body Cricket's Body: Bombs split outwards into 4 tiny bombs, which detonate almost immediately.
  • Fire Mind Fire Mind: Bombs leave behind a fire like Hot Bombs Hot Bombs.
  • Afterbirth-exclusive content Fruit Cake Fruit Cake: The random tear effects are instead applied on bomb explosion. Some of the normal effects are replaced with bomb-specific effects, like Glitter Bombs Glitter Bombs.
  • Afterbirth-exclusive content Glitter Bombs Glitter Bombs: Each bomb fired has a chance of dropping a random consumable or trinket (rarer) after exploding. This synergy theoretically gives you an infinite supply of consumables.
  • Afterbirth-exclusive content Holy Light Holy Light: No effect.
  • Afterbirth-exclusive content Host Hat Host Hat: The item grants invincibility from explosions, preventing self-damage.
  • Added in Afterbirth Hot Bombs Hot Bombs: Bombs leave behind fire that damages enemies on contact after exploding.
  • Homing Tears: Bombs home in on enemies.
  • The Inner Eye The Inner Eye: Shoots 3 bombs instead of 1, but decreases fire rate.
  • Ipecac Ipecac: Isaac is immune to his own bomb shots (not explosives or placed bombs) and damage is massively increased, as the +40 damage from Ipecac is run through the damage multiplier of Dr. Fetus. Shots will also explode immediately on impact with enemies, rocks or walls. If this synergy is mixed with Sad Bomb, Isaac will remain immune to the bomb itself, but not to the explosive tears. Mixing this synergy with Monstro's Lung Monstro's Lung renders Isaac no longer immune to his own shots, also they will explode as soon as you shoot.
  • The Ludovico Technique The Ludovico Technique: Bomb can be controlled before exploding, similar to Epic Fetus Epic Fetus.
  • Monstro's Lung Monstro's Lung: Same effect as 20/20 20/20, except retains fire rate.
    • Added in Afterbirth Shoots 6 bombs which need to be fully charged before firing. The bombs detonate simultaneously.
  • Mr. Mega Mr. Mega: Adds 30 flat damage to bomb explosions.
  • Mutant Spider Mutant Spider: Shoots 4 bombs instead of 1, but decreases fire rate
  • Removed in Afterbirth Poison Tears: Poison effects will give bombs a flat +50 damage. This is guaranteed by Ipecac Ipecac, Bob's Curse Bob's Curse, and Scorpio Scorpio, and can also proc from The Common Cold The Common Cold or Pinky Eye Pinky Eye.
    • Added in Afterbirth No damage increase from poison.
  • Nose Goblin Nose Goblin: Each bomb fired has a small chance to home in on enemies.
  • Ouija Board Ouija Board: Bombs will become spectral and pass through objects just like spectral tears do.
  • Polyphemus Polyphemus: Bombs increase in size and do increased damage.
    • Added in Afterbirth Bombs become Mr. Mega Mr. Mega bombs. After they explode, they leave behind a regular-sized bomb.
  • Pyromaniac Pyromaniac: Bomb explosions heal Isaac, granting infinite health as long as Isaac has more than one heart container.
  • Remote Detonator Remote Detonator: Bombs can be detonated early, making it easier to hit moving enemies.
  • Added in Afterbirth Sad Bombs Sad Bombs: Fires tears as normally placed Sad Bombs would. If this synergy is combined with Ipecac, the tears from the bomb become explosive, which Isaac is not immune to. Note: tears fired from previous Dr. Fetus bombs can collide with other Dr. Fetus bombs (can be negated with spectral tears).
  • Afterbirth-exclusive content Scatter Bombs Scatter Bombs: Each bomb splits into 2-4 small bombs, each of which is also affected by Isaac's bomb modifiers.
  • Afterbirth-exclusive content Serpent's Kiss Serpent's Kiss: Causes your bombs to randomly be transformed into poison bombs.
  • Added in Afterbirth Spoon Bender Spoon Bender: The bombs are purple and act as if Isaac had Bobby-Bomb Bobby-Bomb.
  • Afterbirth-exclusive content Tech X Tech X: A laser circle forms around the bomb and kills occasionally drop black hearts.
  • Afterbirth-exclusive content The Wiz The Wiz: Shoots two bombs diagonally.


  • A Lump of Coal A Lump of Coal: No damage increase.
  • Anti-Gravity Anti-Gravity: Tears up, but no anti-gravity effect.
  • Brimstone Brimstone: Overrides Brimstone.
    • Added in Afterbirth: Isaac continuously fires bombs while charging the blood laser. Overrides Azazel's blood laser.
  • Cricket's Body Cricket's Body: Slight tears up and greatly reduced range, but bombs do not split.
    • Added in Afterbirth: Upon exploding, bombs split into four small bombs that are not affected by Isaac's bomb modifiers.
  • Afterbirth †-exclusive content Compound Fracture Compound Fracture: No effect beyond slight range increase, bombs do not split.
  • Dark Matter Dark Matter: Grants a chance for bombs to inflict Fear on enemies
  • Death's Touch Death's Touch: Tear size and shape don't apply, but all other effects apply.
  • Epic Fetus Epic Fetus: Overrides Dr. Fetus.
  • Afterbirth-exclusive content Explosivo Explosivo: Bombs fired have a chance to stick to an enemy, much like Afterbirth-exclusive content Sticky Bombs Sticky Bombs.
  • Guppy: Dr. Fetus Bombs exploding do not spawn flies.
  • Keeper: Decreases Keepers tear rate but he shoots 3 bombs.
  • Loki's Horns Loki's Horns: Grants a chance to fire four bombs in the cardinal directions.
  • Mom's Eye Mom's Eye: Grants a chance to shoot an extra bomb from the back of Isaac's head.
  • Mom's Knife Mom's Knife: Overrides the bomb.
    • Added in Afterbirth: Isaac continuously fires bombs while charging the knife.
  • My Reflection My Reflection: Bombs lose momentum and slide back towards Isaac.
  • Added in Afterbirth Mysterious Liquid Mysterious Liquid: Exploding bombs leave behind a large pool of creep.
  • Number One Number One: Reduces range, increases tear rate, and tints bombs yellow.
  • The Parasite The Parasite: No effect.
    • Added in Afterbirth Bombs split into two bombs upon exploding.
  • Piercing Tears: Bombs travel through enemies.
  • Pulse Worm Pulse Worm: No effect.
  • Soy Milk Soy Milk: Rapidly fires low-damage bombs.
  • Tammy's Head Tammy's Head: Shoots 10 bombs in a circle around Isaac.
  • Technology Technology: Overrides Technology.
    • Added in Afterbirth Both bombs and lasers are fired.
  • Technology 2 Technology 2: Both laser and bombs are fired. If playing as Cain, the ability to fire bombs is removed, leaving only the laser.
  • Tiny Planet Tiny Planet: Bombs fly uncontrollably around the player. This is very dangerous and not recommended.
  • Tough Love Tough Love: Applies damage and radius bonus, however bomb appearance remains unchanged.
    • Added in Afterbirth Tears that would have fired a tooth shot instead become a bomb with the Mr. Mega Mr. Mega effect, dealing more damage and shaking the screen.

In-game Footage



Bug Bug! The black ring generated from the synergy of Dr Fetus and Tech X behaves as a Maw of the Void ring and causes black hearts to drop.


  • The Dr. Fetus and Epic Fetus items are based off of Dr. Fetus, the main villain in Super Meat Boy which is a game by Edmund McMillen (the creator of The Binding of Isaac: Rebirth).
  • This item is used in Challenge #9 (Demo Man).


 PC  KP6M WZAJ (treasure room adjacent to spawn) (normal and hard mode)

 PC  9LCJ RQG8 (treasure room adjacent to spawn) (normal mode only)

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