Baby Pigeon Not Doing Good.. Need Help!!

[jbcanne]

Another question. I have 3 week old Baby Rollers. Both born same day. One is at a normal size and is eating own his/her own. The second baby is 1/2 the size and still a baldy. Has been full of life up until this afternoon. This little one still needs help on feeding. Just now for feeding she didn't want to move much. Falling side to side and head first. Why or what would cause this to happen this fast? I feed her alittle.. not much. Layed her back in the tank with her brother and she has lost more energy with head holding. Again why? Is there anything out there that could spring her back into action or could the corn and peas be wrong for her?