Hello, I incubated and hatched three baby chicks in early July. Bantam Americauna-Cochin mix. One chick is just fine. Second chick developed leg weakness last week. He started favoring one leg (I thought it was an injury). By the next day, both legs would "give out" causing him to fall over. About then, second bird started limping on one foot. In another day, both of her legs were weak (although not as bad as other chick). They can sit and "stand" on their elbows, but cannot hold themselves upright or walk....they sort of flop around. They are eating and drinking and up until this started, they were able to run and walk perfectly. All three chicks have the same father, but there are two hens, so they may not have the same mother. It doesn't look like spraddle leg, but I can't rule it out. Could it be a vitamin deficiency? I have given them Cod Liver Oil for the past day. They were raised on Purina Chick Starter for the first month, now on Layena Crumbles. Any assistance is greatly appreciated. Thank you.