Button Quail unable to walk

[freeflying.kmf]

I have a 1-month old button quail that I've had from an egg. Recently, I've noticed that the poor baby is hardly able to walk. He (?) seems to slide around on his side, pushing himself along with his legs. I'm not sure if it's always the same side, but this problem has been getting worse as he gets older! I've got him on pine chips, so it's not spraddled legs, but I'm not sure what it is! I've raised 100's (literally!) of chickens, ducks, and guinea fowl from eggs before and never seen this... what's up?! And can I fix it? If not, how do I prevent it-- I've got 25 more quail in the incubator, since this lil guy was the only one of the 5 eggs I had last time to come to term. I don't want this to happen again. He gets around ok, but it's pathetic to watch.