My Buff Orpington chick is roughly 6-7 weeks old but barely has feathers. In fact the other 3 BO's I bought with this one all have nice feathers and just about completely feathered with just a little fluff left. But this one has less feathers than my 3 week old barred rocks. Any ideas? I keep him (I think) separated and with my chicks bc I don't want him getting peeked at.