Suggestion:
Lil Delirium: allows you to have duplicate baby with a little bit gray ish color to any picked Baby upon placing .
Dead Sea Scroll: Just random ability effect.
The Poop: should act as a weaker version of meat shield and also removable with the shovel and lets the Baby projectiles pass through it to make the Poop active item more usefull instead of just fart N' Stuff.
Mulliboom: Moves slow but apon death it spawned 2 ot 3 flies around its neighboring tiles
Good Luck!
Is just a sugggestion but I hope you catch better ideas for your Cool game.