Rotten Baby

Spawns a familiar that spawns a Blue Fly when Isaac shoots. It can only have one Fly at a time.

"Infested friend"

• Spawns a familiar which does not shoot tears, but spawns friendly Blue Flies when the player holds down the 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.

• 
  Fish Tail - Rotten Baby will spawn two flies at a time.
• 
  Mongo Baby - Mongo Baby will also spawn flies.

• Baby Shop
• Rotten Beggar
• Devil Room
• Treasure Room
• Devil Room (Greed Mode)
• Treasure Room (Greed Mode)