My 3-week old Wyandottes have a runt among them! Seriously, 1 of them is still the same size as a 1-week old chick (1/2 the size of the other ones). She doesn't seem to be maturing at all, kinda like a pituitary gland problem or something. Do I just wait until she catches up with the rest of the flock? She is eating and drinking normally, just not developing other than a few small feathers coming out on the wings.