One of the chicks (polish) that hatched over the weekend cannot walk. Its legs look fine and seem strong. The chick is not able to stand up and keep balance. It lays on the side and chirps until I pick it up, or throws itself from side to side. It hatched a day before due date (day 20), but my chicks always do and all other 12 are perfectly fine. This one was last and when I found it it was laying on its back and all others were picking at it. It seems very alert and feisty now. Just cannot stand up and is not happy lying down either. I put it overnight in the cup so it would work on its leg muscles, but that didn't seem to help. Besides its legs seem very stroneg when it pushes against my hand. I'm afraid it may be neurological. Is there any hope? Will vitamins help with that? What should I do?