About 7 weeks ago my son got new chicks, an assortment as we like to have a few of each. We got them from the local feed store. 10 chicks altogether, and they are doing great. Only problem is he got a Buff Brahma that will not grow. It is still fuzzy, never feathered. Its wings are the tiniest wings I ever seen. It's body has gotten a tiny bit bigger. We have chicks we hatched that are 2 weeks old and they are way bigger then this chick. When we open the brooder door all the others end up flying out, she attempts, but falls. I have never seen anything like her and it just blows my mind. She runs and plays, eats, drinks, does everything completely normal, just will not grow or feather out.... Anyone ever had this issue? If so what is it and what happened in the long run? Thanks in advance for any and all advice.