i was sent a dark brahma chick in my mcmurray order...he is just under 4 weeks old. i have never raised this breed, and i am wondering if they are all really slow to develop? i have white leghorns, buff orps and marans the same age...they are almost all feathered out, and are larger than the brahma. he has very few real feathers (only on the his wings), still fuzzy/ chick-like, and a little smaller than the others. is this normal for the breed?