Lil Larva is a trinket in The Binding of Isaac, added in the Afterbirth DLC.

Destroying poop will spawn a Blue Fly.

Can drop from destroying polyps in Corpse.

This page shows the latest information as of the new Repentance+ (Online Co-op) DLC.
To see information about this trinket for the previous Repentance version, check this page instead.

The following special synergies and interactions for Lil Larva have been documented.

* Note that not all possible synergies and interactions are listed here.

Below is the Internal Item Description as shown in-game.
Note that some stat changes are not displayed here. Please see the main description for the full effects.

Lil Larva

• Destroyed poops spawn a blue attack fly
• Golden Trinket (without Mom's Box): Destroyed poops spawn 2 blue attack flies
• Mom's Box: Destroyed poops spawn 2 blue attack flies
• Mom's Box + Golden Trinket: Destroyed poops spawn 3 blue attack flies

• Check out the trinket description on the external Isaac Wiki.