I got 8 chicks in the mail 2 weeks ago and one appears to not be growing as fast as the other. She is much smaller and her wings don't seem to be growing normally... they are very scraggly and she doesn't stretch them like the other chicks do. I'm probably overthinking this but is there anything to be worried about? From this picture I also notice that her skin is reddish underneath her wings.
Sorry, it's hard to get a good picture of this one as she doesn't often stray far from the others.

Sorry, it's hard to get a good picture of this one as she doesn't often stray far from the others.