I've got two month old Easter eggers who are growing well and feathering in, but one has a completely bald breast bone from her neck almost to her vent, and part of her thighs. She's still got some chick down on her head, but most of the rest of her body is feathered or bald. She looks fine from a distance---I just see it if I turn her over. Her poops look OK and she's eating and behaving well. Her "sister" is a little bald in the same area, but not as bad. Is this normal? I don't see any mites or anything at all to worry about other than all that naked skin. This is my first experience with brooding chicks, so I worry about things I don't know about.