This is my 12 wk old chick, it's growing extremely slowly compared the the rest of the bunch and the newborn fluff come off (I hope I said that right.. i'm a new chicken person) but hardly any feathers came in. Any ideas? Why? What do I do? The other two in the photo are the same age, same hatch. I've been watching very closely and it's not getting picked on, not intchy or scratchy, eats and drinks without any problems, in fact seems perfectly normal except for size and feathers. It does snuggle up to the others when chilli.