My RIR chick, about 4 days old, has a limp that I noticed about 2 days ago and has gotten a little worse since. The leg looks perfectly normal. It has some dark veins, but nothing that looked particularly problematic. I noticed just now that there is a small, hard bump on his belly on the same side as the limping leg. He is growing pretty well but will not stop chirping at all until he goes to sleep, and is a lot louder than any other chick I have had. Should I be worried about the limp? Will he maybe grow out of it?