I have 3-4 week old cochin/silkie mix chicks right now. Everything was great until yesterday when one of them stopped walking. She just lays on her side with her legs out to the side. She almost acts like she has spraddle leg. She won't support weight unless she has to, to get water or food. Can a chick this old get spraddle leg and if she can can it be fixed? I have had day olds with it and have fixed it, but thought they were fine after that. Any one have any idea?