Dr. Fetus

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Item icon
Item altar

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Character appearance
 
Tear appearance
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Item Pool Treasure Room.png Treasure Room
Added in AfterbirthGreed mode onlyItem Pool Treasure Room.png Treasure Room
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Added in Afterbirth (page 1, column 11, line 3)
Removed in Afterbirth (page 1, column 1, line 6)
 
A Fetus in a Jar Defeat Mom's Heart 9 times
A Fetus in a JarA Fetus in a Jar

Dr. Fetus is a Special unlockable passive item.

Effects

  • 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.

Notes

  • Dr. Fetus overrides multiple tear effect items but benefit from some (but not all) bomb-enhancing effects like Mr. Mega Mr. Mega
    Mr. Mega Icon.pngGives Isaac 5 bombs, and makes all dropped bombs larger, which have an increased blast radius and increased damage.
    .
    • 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.

Synergies

  • 20/20 20/20
    20 20 Icon.pngGrants double shot.
    /The Inner Eye The Inner Eye
    The Inner Eye Icon.pngGrants triple shot but decreases tears.
    /Mutant Spider Mutant Spider
    Mutant Spider Icon.pngGrants quadruple shot but decreases tears.
    : Fires multiple bombs at the same time.
  • Added in Afterbirth † Angelic Prism Angelic Prism
    Angelic Prism Icon.pngGrants a prism orbital with a large orbital radius. Tears that pass through the prism split into four multi-colored tears.
    : When bombs pass through the prism, they will be quadrupled.
  • Blood Clot Blood Clot
    Blood Clot Icon.pngIncreases damage by 1 and range by 5 for tears fired from the left eye.
    : Bonus damage applies on every shot. Also turns bombs red.
  • Added in Afterbirth Bob's Bladder Bob's Bladder
    Bob's Bladder Icon.pngLeaves a pool of green creep under all bombs Isaac places, which damages enemies that walk over it.
    : Creep is left along the path that the bomb travels.
  • Bobby-Bomb Bobby-Bomb
    Bobby-Bomb Icon.pngGives Isaac 5 Bombs, and causes all dropped bombs to home towards the closest enemy.
    : Bombs slowly home in on enemies.
  • Added in Afterbirth Bomber Boy Bomber Boy
    Bomber Boy Icon.png+5 bombs. Isaac's bombs will now explode in a large cross-shaped pattern (roughly 5 bombs explosions wide). This also affects troll bombs.
    : Bombs explode in a large cross pattern.
  • Butt Bombs Butt Bombs
    Butt Bombs Icon.pngGives +5 bombs and makes all bombs Butt Bombs that fill the room with gas, damaging and confusing all enemies.
    : Bombs confuse enemies, and deal minor damage to the entire room, regardless of impact.
  • Chocolate Milk Chocolate Milk
    Chocolate Milk Icon.pngGrants charged tears that deal greater damage when fully charged.
    : Slightly increases fire rate; no effect on damage.
  • Added in Afterbirth Cricket's Body Cricket's Body
    Cricket's Body Icon.pngGrants -1 Tear Delay and reduces Range. When tears hit an object or deplete their range, they spawn 4 smaller tears, whose Range and Damage scale with Isaac's.
    : Bombs split outwards into 4 tiny bombs, which detonate almost immediately.
  • Fire Mind Fire Mind
    Fire Mind Icon.pngGrants flaming tears that deal burning damage over time. Tears have a chance to explode on impact with an enemy, which creates a fire at the location of the explosion.
    : Bombs leave behind a fire like Hot Bombs Hot Bombs
    Hot Bombs Icon.pngGrants 5 bombs. Isaac's bombs leave behind fire that damages enemies upon contact.
    .
  • Added in Afterbirth Fruit Cake Fruit Cake
    Fruit Cake Icon.pngIsaac's tears gain a random effect that changes every shot.
    : 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
    Glitter Bombs Icon.pngGives Isaac 5 bombs, and makes Isaac's bombs have a chance to drop random pickups or charm enemies when they explode.
    .
  • Added in Afterbirth Glitter Bombs Glitter Bombs
    Glitter Bombs Icon.pngGives Isaac 5 bombs, and makes Isaac's bombs have a chance to drop random pickups or charm enemies when they explode.
    : 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.
  • Added in Afterbirth † Haemolacria Haemolacria
    Haemolacria Icon.pngTears are now fired in an arc. Upon hitting the floor, an obstacle, or an enemy, they burst into many smaller tears in all directions. Increases tear delay.
    : Significantly increased tear delay. Isaac fires a large arcing tear reminiscent of a bomb that scatters into 3-5 bombs that explode simultaneously.
  • Added in Afterbirth Holy Light Holy Light
    Holy Light Icon.pngIsaac has a random chance to fire a Holy tear, which, when it hits an enemy, will spawn a Crack the Sky-style light beam on the same enemy, dealing damage.
    : No effect.
  • Added in Afterbirth Host Hat Host Hat
    Host Hat Icon.pngA host familiar that sits on Isaac's head and has a random chance to block enemy shots and retaliate with 3 tears. Grants immunity to explosions.
    : The item grants invincibility from explosions, preventing self-damage.
  • Added in Afterbirth Hot Bombs Hot Bombs
    Hot Bombs Icon.pngGrants 5 bombs. Isaac's bombs leave behind fire that damages enemies upon contact.
    : Bombs leave behind fire that damages enemies on contact after exploding.
  • Homing Tears: Bombs home in on enemies.
  • The Inner Eye The Inner Eye
    The Inner Eye Icon.pngGrants triple shot but decreases tears.
    : Shoots 3 bombs instead of 1, but decreases fire rate.
  • Ipecac Ipecac
    Ipecac Icon.pngReplaces tears with explosive and poisoning projectiles fired in an arc from the mouth.
    : 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
    Monstro's Lung Icon.pngIncreases damage and grants a charged shot that fires multiple tears in the same fashion as Monstro.
    renders Isaac no longer immune to his own shots, also they will explode as soon as you shoot.
  • The Ludovico Technique The Ludovico Technique
    The Ludovico Technique Icon.pngInstead of firing tears, Isaac controls one floating tear that hover over obstacles. This tear deals constant damage when held in place over an enemy.
    : Bomb can be controlled before exploding, similar to Epic Fetus Epic Fetus
    Epic Fetus Icon.pngIsaac's tears are replaced with guided missiles, like those used by the Doctor's Remote.
    .
  • Monstro's Lung Monstro's Lung
    Monstro's Lung Icon.pngIncreases damage and grants a charged shot that fires multiple tears in the same fashion as Monstro.
    : Same effect as 20/20 20/20
    20 20 Icon.pngGrants double shot.
    , 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
    Mr. Mega Icon.pngGives Isaac 5 bombs, and makes all dropped bombs larger, which have an increased blast radius and increased damage.
    : Adds 30 flat damage to bomb explosions.
  • Mutant Spider Mutant Spider
    Mutant Spider Icon.pngGrants quadruple shot but decreases tears.
    : 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
    Ipecac Icon.pngReplaces tears with explosive and poisoning projectiles fired in an arc from the mouth.
    , Bob's Curse Bob's Curse
    Bob's Curse Icon.pngGives 5 bombs and grants all bombs poison effect.
    , and Scorpio Scorpio
    Scorpio Icon.pngGrants poison tears, which deal damage over time when inflicted.
    , and can also proc from The Common Cold The Common Cold
    The Common Cold Icon.pngAdds a chance to shoot poison tears, dealing damage over time when inflicted.
    or Pinky Eye Pinky Eye
    Pinky Eye Icon.pngAdds a 10% chance to shoot a poison tear, dealing damage over time when inflicted.
    .
    • Added in Afterbirth No damage increase from poison.
  • Added in Afterbirth † Nose Goblin Nose Goblin
    Nose Goblin Icon.pngChance to fire a booger that sticks to enemies and deals damage over time.
    : Each bomb fired has a small chance to home in on enemies.
  • Ouija Board Ouija Board
    Ouija Board Icon.pngGrants spectral tears that travel through obstacles (but not enemies) instead of breaking on impact with them.
    : Bombs will become spectral and pass through objects just like spectral tears do.
  • Polyphemus Polyphemus
    Polyphemus Icon.pngMakes Isaac shoot one huge tear. Also reduces Tears to minimum. Damage increased . If tear does more damage than an enemy's life, the tear continues to travel with the extra remaining damage.
    : Bombs increase in size and do increased damage.
    • Added in Afterbirth Bombs become Mr. Mega Mr. Mega
      Mr. Mega Icon.pngGives Isaac 5 bombs, and makes all dropped bombs larger, which have an increased blast radius and increased damage.
      bombs. After they explode, they leave behind a regular-sized bomb.
  • Proptosis Proptosis
    Proptosis Icon.pngTears start out massive with high damage, and then shrink down and become weaker over a short range.
    : Doubles damage with no penalty for distance.
  • Pyromaniac Pyromaniac
    Pyromaniac Icon.pngIsaac heals 1 heart instead of taking damage from an explosive source. Adds 5 bombs.
    : Bomb explosions heal Isaac, granting infinite health as long as Isaac has more than one heart container.
  • Remote Detonator Remote Detonator
    Remote Detonator Icon.pngUnlimitedBombs you place explode only when you use this item. Gives 5 bombs.
    : Bombs can be detonated early, making it easier to hit moving enemies.
  • Added in Afterbirth Sad Bombs Sad Bombs
    Sad Bombs Icon.png+5 Bombs. Upon exploding, bombs shoot 8 tears off in every direction, similar to Tammy's Head. The tears are affected by any tear modifiers Isaac has on his own tears.
    : 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).
  • Added in Afterbirth Scatter Bombs Scatter Bombs
    Scatter Bombs Icon.pngAdds 5 bombs. Isaac's bombs explode into 2-4 tiny bombs
    : Each bomb splits into 2-4 small bombs, each of which is also affected by Isaac's bomb modifiers.
  • Added in Afterbirth Serpent's Kiss Serpent's Kiss
    Serpent's Kiss Icon.pngTears now have a random chance to apply a poison effect, causing 4 or 6 damage per tick to enemies (Similar to The Common Cold item). Isaac now deals poison damage on contact with enemies similar to The Virus item (Damage over time 4 or 6 per tick). Enemies that were poisoned have a chance to drop a black heart when killed.
    : Causes your bombs to randomly be transformed into poison bombs.
  • Added in Afterbirth Spoon Bender Spoon Bender
    Spoon Bender Icon.pngGrants Isaac homing tears.
    : The bombs are purple and act as if Isaac had Bobby-Bomb Bobby-Bomb
    Bobby-Bomb Icon.pngGives Isaac 5 Bombs, and causes all dropped bombs to home towards the closest enemy.
    .
  • Added in Afterbirth Tech X Tech X
    Tech X Icon.pngTears are replaced with laser rings that pierce through enemies and deal damage to enemies within them. Can be charged to increase the size of the ring.
    : A laser circle forms around the bomb and kills occasionally drop black hearts.
  • Added in Afterbirth The Wiz The Wiz
    The Wiz Icon.pngTears simultaneously fire out of both eyes diagonally, similar to the effect of the R U A Wizard? pill. Isaac's tears also travel above all obstacles.
    : Shoots two bombs diagonally.

Interactions

  • A Lump of Coal A Lump of Coal
    A Lump of Coal Icon.pngThe more distance tears travel, the more damage they will do.
    : No damage increase.
  • Anti-Gravity Anti-Gravity
    Anti-Gravity Icon.png-2 Tear Delay. Tears float in position until firing ceases, after which they will fly off in the direction they were shot in.
    : Tears up, but no anti-gravity effect.
  • Brimstone Brimstone
    Brimstone Icon.pngTears are replaced by a laser beam that pierces through all enemies and obstacles in its path and deals high damage. Can only be fired after a short charge-up period.
    : 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
    Cricket's Body Icon.pngGrants -1 Tear Delay and reduces Range. When tears hit an object or deplete their range, they spawn 4 smaller tears, whose Range and Damage scale with Isaac's.
    : 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.
  • Added in Afterbirth † Compound Fracture Compound Fracture
    Compound Fracture Icon.pngIncreases range. Tears turn into bones, which shatter into 1-3 bone shards upon hitting an enemy or obstacle.
    : No effect beyond slight range increase, bombs do not split.
  • Dark Matter Dark Matter
    Dark Matter Icon.pngIncreases Damage by 1 and adds a chance to shoot fear tears.
    : Grants a chance for bombs to inflict Fear on enemies
  • Death's Touch Death's Touch
    Death's Touch Icon.pngIncreases Damage by 1.5, reduces Tears by 0.3 and increases tear size. Grants piercing tears. Tears are replaced by Death's scythes, which is a cosmetic effect only.
    : Tear size and shape don't apply, but all other effects apply.
  • Epic Fetus Epic Fetus
    Epic Fetus Icon.pngIsaac's tears are replaced with guided missiles, like those used by the Doctor's Remote.
    : Overrides Dr. Fetus.
  • Added in Afterbirth Explosivo Explosivo
    Explosivo Icon.pngIsaac's tears have a chance to stick to enemies and explode.
    : Bombs fired have a chance to stick to an enemy, much like Added in Afterbirth Sticky Bombs Sticky Bombs
    Sticky Bombs Icon.png+5 bombs. Bombs stick to enemies and spawn 2-4 blue spiders if they kill an enemy.
    .
  • Added in Afterbirth † The Forgotten: The charge attack is replaced by a live bomb in the Forgotten's hand. It is thrown on release, but may also explode in his hand if it's held too long. The range of the throw doesn't depend on length of charge, unless the bomb explodes mid-air. The melee attack is unaffected.
  • Guppy: Dr. Fetus Bombs exploding do not spawn flies.
  • Keeper: Decreases Keepers tear rate but he shoots 3 bombs.
    • Keeper + The Inner Eye The Inner Eye
      The Inner Eye Icon.pngGrants triple shot but decreases tears.
      Decreases Keepers tear rate even further but he shoots 6 bombs.
  • Added in Afterbirth Kidney Stone Kidney Stone
    Kidney Stone Icon.pngRandomly while firing tears, Isaac will stop firing and turn red, where he will charge and release a lot of 'tears' in one go. In the burst of tears is a kidney stone which deals a lot of damage.
    : Not recommended. Bombs spawn directly in front of Isaac making self damage very likely.
  • Added in Afterbirth † Lachryphagy Lachryphagy
    Lachryphagy Icon.pngIsaac's tears decelerate as they travel. Upon stopping or hitting an obstacle, they burst into 8 tears in all directions. Tears can be fired into other tears to feed them, increasing their damage.
    : Overridden by Dr. Fetus.
  • Added in Afterbirth † Lead Pencil Lead Pencil
    Lead Pencil Icon.pngAfter every 15 tears fired, Isaac will fire a high-damage cluster of tears.
    : Overridden by Dr. Fetus.
  • Loki's Horns Loki's Horns
    Loki's Horns Icon.pngGives a random chance for projectiles to fire in all 4 cardinal directions.
    : Grants a chance to fire four bombs in the cardinal directions.
  • Added in Afterbirth Marked Marked
    Marked Icon.pngIsaac will now fire tears automatically directed at a red target on the ground which is controlled by the player. This allows for a full 360 degree tear firing radius. Can be overridden by other tear modifiers such as Mom's Knife or Brimstone.
    : Overridden by Dr. Fetus except for stat effects which are applied.
  • Mom's Eye Mom's Eye
    Mom's Eye Icon.pngAllows Isaac to fire tears from the back of his head.
    : Grants a chance to shoot an extra bomb from the back of Isaac's head.
  • Mom's Knife Mom's Knife
    Mom's Knife Icon.pngIsaac's tears are replaced by a knife that pierces enemies, can travel through obstacles, and can hurt enemies while Isaac is holding it. Holding down the fire button before firing increases its range and power.
    : Overrides the bomb.
    • Added in Afterbirth: Isaac continuously fires bombs while charging the knife.
  • My Reflection My Reflection
    My Reflection Icon.pngGives Isaac's tears a boomerang effect, and increases range and shot speed.
    : Bombs lose momentum and slide back towards Isaac.
  • Added in Afterbirth Mysterious Liquid Mysterious Liquid
    Mysterious Liquid Icon.pngTears leave a small, short lasting pool of creep on impact or when their range is depleted.
    : Exploding bombs leave behind a large pool of creep.
  • Number One Number One
    Number One Icon.png+1.5 tears, -15.77 range
    : Reduces range, increases tear rate, and tints bombs yellow.
  • The Parasite The Parasite
    The Parasite Icon.pngIsaac's tears split in two when they hit something.
    : No effect.
    • Added in Afterbirth Bombs split into two bombs upon exploding.
  • Piercing Tears: Bombs travel through enemies.
  • Added in Afterbirth † Pop! Pop!
    Pop! Icon.pngReplaces Isaac's tears with eyeballs that can bounce off of each other. The eyeballs are not limited by range, and will instead dissipate when they stop moving or when hitting an enemy or obstacle.
    : Overridden by Dr. Fetus.
  • Pulse Worm Pulse Worm
    Pulse Worm Icon.pngShots pulse in size.
    : No effect.
  • Soy Milk Soy Milk
    Soy Milk Icon.pngTears shrink and do much less damage, but fire in very rapid succession.
    : Rapidly fires low-damage bombs.
  • Tammy's Head Tammy's Head
    Tammy's Head Icon.png1 roomsShoots 10 tears in a circle around Isaac, which retain the damage, shot speed, and special effects (such as poison) of Isaac's tears.
    : Shoots 10 bombs in a circle around Isaac.
  • Technology Technology
    Technology Icon.pngReplaces tears with a piercing laser with unlimited range.
    : Overrides Technology.
    • Added in Afterbirth Both bombs and lasers are fired.
  • Technology 2 Technology 2
    Technology 2 Icon.pngDecreases damage and replaces right eye tears with a unlimited range, piercing laser which fires continuously.
    : Both laser and bombs are fired. If playing as Cain, the ability to fire bombs is removed, leaving only the laser.
  • Added in Afterbirth † Technology Zero Technology Zero
    Technology Zero Icon.pngConnects Isaac's tears with electricity that can damage enemies.
    : Overridden by Dr. Fetus.
  • Tiny Planet Tiny Planet
    Tiny Planet Icon.pngRange up and makes shot tears revolve around Isaac until they drop.
    : Bombs fly uncontrollably around the player. This is very dangerous and not recommended.
  • Tough Love Tough Love
    Tough Love Icon.pngAdds a chance to shoot a tooth instead of a tear, which deals greater damage than regular tears.
    : 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
      Mr. Mega Icon.pngGives Isaac 5 bombs, and makes all dropped bombs larger, which have an increased blast radius and increased damage.
      effect, dealing more damage and shaking the screen.
  • Added in Afterbirth † Trisagion Trisagion
    Trisagion Icon.pngTears are replaced with piercing white blasts of light.
    : Overridden by Dr. Fetus.

In-game Footage

Gallery

Bugs

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.

Trivia

  • 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).

Seeds

 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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