I got 4 chicks from a nearby breeder. 2 are gold cuckoo marans, and 2 are blue gold partridge brahmas. They are about 4-5 weeks old i think, and 1 is not growing like the others. compared to the other brahma, he is smaller and only has some feathers on the wings. The other one has lots of feathers. Could the little guy be stunted or something? Is there anything i can do too help him? he has free access to food and water, and eats and drinks as much as the other ones (i know he is eating since i have the 4 in my bedroom, so i see them all the time). Thanks in advance.