trouble walking ? ? ?

[kbrun]

My chicks just hatched yesterday. Two of them are having trouble walking. One foot is fine and one foot turns in. They look like they are trying to walk on their leg joint. They can get around, but mostly they just lie down. What can I do? What is this? What is the cause? They seem to be healthy otherwise. It's not spraddle leg because the legs don't go out to the side.