I have two silkie chicks that are three days old. I just noticed that they are having trouble walking and there toes are curled under. I did not notice any thing wrong with them when they hatched. I do have 16 chicks so it is possible that I overlooked them, but it seems to be something that is developing as opposed to something they hatched with. They are currently brooded on paper towels. Is something in my brooder causing this? How can I help them? Thanks!