I'm a first-time chick mom! Last week we got 4 three-day-old baby chicks, 2 RR and 2 BR. Today they are 11 days old. Last Sunday evening I noticed one the RRs, Penny, started acting lethargic and just "off" a little. The next day she did have a case of pasty butt, but I washed her bottom and didn't have another issue until last night. Also washed that off. She is not growing like the others, she's noticeably smaller. The other three will peck and play and run around and attempt to fly out of my hand, and they bed down together. But Penny always hangs out by herself, never with the group. She sleeps by herself. Sometimes she sticks her wings out to steady herself, like she loses her balance if they bump into her. She lets me hold her (to check or clean her bottom) and offers no resistance whatsoever. She seems to be eating and drinking good. The other chicks do not pick on her or bully her, but they just ignore her. Are some chicks just late bloomers and loners, or is there something more I should be doing for her? I have given them mashed up egg a couple of times, but other than that they have only had chick starter. I don't want to lose this sweet baby and am worried about her. Any insight as to why she isn't growing like the others and keeps to herself? Thanks so much for any advice!