I picked up 10 chicks on Saturday, 7 buff orpingtons and 3 black stars (I believe). One of the black stars seems to breathe hard all of the time. She cleans herself, eats, drinks and poops. She seems very alert to noises and us around her. She does seem a little smaller than the other girls. I'm worried that something is wrong with her. I'm a just being a worry wart, or is there something I should be doing for the girl?