Rotten Baby is a passive item.
- Spawns a familiar which does not shoot tears, but spawns friendly Blue Flies when Isaac holds down a fire key.
- This item belongs to the Conjoined set. Collecting three items from this set will transform Isaac into a three-faced version of himself.
- It will spawn a maximum of one Fly at a time.
- Blue Flies deal twice Isaac's damage.
- Flies will be generated regardless of Isaac being able to fire tears normally.
- Fish Tail: Rotten Baby will spawn two flies at a time.
- Mongo Baby: Mongo Baby will also spawn flies.
- BFFS!: No effect. Rotten Baby becomes larger, but this is only a cosmetic change.
- Hive Mind: The real BFFS! for Rotten Baby. Fly damage is doubled.
- 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.
- This item is used in Challenge #19 (The Family Man).
- Even though the right side of Rotten Baby's face is decayed, when his sprite faces left, his left side appears decayed as well.
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 EBH3 A1PM (First floor treasure room)
PS4 RMJ8 JHGG (Treasure Room adjacent to spawn)
|Bug!||PC Rotten Baby will be able to spawn more than one friendly fly if the run is left and then resumed.|
|The Binding of Isaac: Rebirth|
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