I have 6 Millie de Fleur d'Uccles that are about 6 weeks old I think? One of the largest boys is having trouble walking/roosting. All the other chicks are roosting except him. He is eating and drinking fine, he will stick both legs out in front of him if you pick him up and he cannot roost on your hand or anything else at all. He is also very weak legged and wobbly when he walks. Once in a while he seems ok, but the rest of the time...not so much. What should I do???