I have a handful of almost 2 month old chicks that seem to all have a hard time walking. It doesn't seem to be getting better, and I feel that it wasn't this bad when they first hatched. I see some some crooked toes, but I'm afraid it's too late to fix that. Could that be the only reason they're having a hard time? They kind of just stumble around, and if possible, I'd like to do something to help them become more mobile for when I turn them outside. They don't try to fly, and they don't roost. These chicks are barnyard crosses from my backyard flock that I incubated myself. I've heard there can be complications from fluctuations and inconsistencies in temperature during the incubation process, i.e. crooked toes, etc. I hatched 12 of 21, but only 4 have survived. I lost a the majority of them recently, in very close time increments to the next. Could they have a disease that's causing this (i.e. Mareks)? Should I get them vaccinated or give them something? Any and all input is appreciated. First time incubating chicks.