I have a Blue Orpington Boy that has grown very quickly over the last few weeks and now he has longer legs than fits his body but he is walking like hislegs are real stiff, high stepping walking on his toes and has no balance and he can not roost he would rather lay in the coop floor. During the day he lays down most of the time and he cant run that well or he falls to one side. What could be wrong with my poor boy? He is only 4 months old.