I have a chick with a recurring case of pasty butt. I've cleaned her several times and taken suggestions from others about molasses water and sugar water. She will now eat wet starter mush quite excitedly and is pooping regularly, but the poor thing is TINY, less than half the size of my other chick, that hatched the same day. She seems to be improving though. However, I have never seen her sit. She leans on the other chicks to sleep, or even attempts to sleep standing up. She's 10 days old now and about the size her bator mate was at 2 days. Why won't she sit, how can I help her?