We have 11 chicks that are about 2 weeks old. One of the Buff Orpingtons is just tiny, probably about half the size of the other BO that (supposedly?) hatched the same day. The bigger BO is getting tons of feathers, while the tiny one is all fluffy still. Also, the tiny one gets pasty butt pretty much every day. I have to clean it's little booty at least once a day. It seems otherwise fine though. Eats, drinks, seems feisty enough. We've had them for a week and a half. Thoughts?