I've got some cool baby ideas, but they're pretty basic:
Twisted Pair (Costs 200): Similiar to the repeater in PvZ, just shoots twice
Quints (Costs 125): Similiar to the peapod in PvZ2, shoots just like a normal brother bobby but can place up to 5 on a single space, allowing for 5 shots for a total of 625
Guardian Angel (Costs 125 or 150): Similiar to the pumpkin in PvZ, can only be placed on another baby, giving it additional HP similar to the Cube of Meat, it will count as a defensive baby.
Lil Abadonn: (Costs 150 or 200): Similiar to the fire dragon from PvZ2 (but different), each shoot will damage all enemies in a 3x4 area (centered but only 1 column behind it and 2 in front)
Succubus: (Costs 300 or 325): The same effect as Hollowed Ground, but will instead give damage boost to babies within 3x3 area.
You may already have these or maybe not, but i just want to give you ideas, because that's what this place is all about.