I have a bantam cochin chick that is about a month old and seems to not be growing. She's eating, drinking and behaving normally but just doesn't look right. She is less than half the size of the other chicks of the same age and breed. I moved her in with my single penedesenca chick and the pene has now surpassed her in growth even though she is two and a half weeks younger. The pene chick is growing normally so the diet is right but she may be having trouble with absorption. Her feather development is also retarded and she still has most of her down when her clutchmates are fully feathered. She only has wing and foot feathers. The feathers on her upper wings grow straight out giving an angel wing appearance. What is this and how can I treat it?