I have 7 chicks left from the 8 that I got. They are Golden Wyandottes and will be 5 weeks old on Wed. One has already died. He stopped growing out his feathers a week or so ago. He held his wings out slightly. He was smaller thatn the others, but bigger than one. This one smaller chick still has his down. verry few feathers showing. He is acting fine. He is half the size of the other ones. I noticed this morning that he wasnt eating. I have been feeding them the medicated feed. What can I do? Thank you.