Binding of Isaac: Rebirth Wiki
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Rotten Baby is a passive item.

Effect[]

  • Spawns a familiar which spawns friendly Blue Flies when Isaac holds down a fire key.
  • Added in Afterbirth This item belongs to the Conjoined set. Collecting three items from this set will transform Isaac into a three-faced version of himself.

Notes[]

  • Spawns one Fly at a time.
  • Blue Flies deal 2x Isaac's damage.
  • Flies will be generated regardless Isaac's ability to fire tears normally.

Synergies[]

  • Added in Afterbirth †Fish Tail Fish Tail: Rotten Baby will spawn two flies at a time.
  • Mongo Baby Mongo Baby: Mongo Baby will also spawn flies.

Interactions[]

  • BFFS! BFFS!: Rotten Baby becomes larger, but this is only a cosmetic change.
  • Hive Mind Hive Mind: Fly damage is doubled.
  • Added in RepentanceThe Twins The Twins: Unlimited flies can be slowly generated by walking back and forth between rooms while firing. A new fly will generate each time Rotten Baby is duplicated.

In-game Footage[]

Trivia[]

  • This item is used in The Family Man (challenge #19).
  • Even though the right side of Rotten Baby's face is decayed, when his sprite faces left, his left side appears decayed as well.

Seeds[]

PC RXTX MGYV (Treasure Room adjacent to spawn)

PC Q9EQ XVQE (Treasure Room adjacent to spawn)

PC RDAM YDAV (Treasure Room adjacent to spawn)

PC Added in Afterbirth / Removed in Afterbirth † EBH3 A1PM (First floor treasure room)

PC Added in Afterbirth † Normal and hard modes only CGRP WYLB (Treasure Room adjacent to spawn)

PS4 RMJ8 JHGG (Treasure Room adjacent to spawn)

Bugs[]

Bug Bug! PC Rotten Baby will be able to spawn more than one friendly fly if the run is left and then resumed.


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