last night, one of my baby chicks (2 weeks old???) couldn't look up. it kept looking in between its legs and ended up flipping. i also noticed that it seemed to hurt if i turned its head. it seems to be picking its feathers, but is it a disease??? it has been vaccinated against mareks. what do i do???? i fed it food and water. but does it have a vitamin deficiency?but this is the only chick that has it. the rest of them are fine. what do i do? update!!!!............ i tried to get it to drink, and when i picked it up, i realized that it's WHOLE neck/chest area, the feathers are all mangled!!! It seems that it IS picking its chest feathers! I touched the chest/neck area, and it seemed that it hurt it. The few feathers there are also dry and crinkly feeling. What disease is this??? What can I do to help? I also found that 2 other chicks have developed curled feet! They were all fine yesterday! What is happening to my babies???