I have a silkie chick, Pixie, that is half the size of her sisters. They all hatched out on the same day and they are all growing. Pixie is just much, much smaller than the other chicks. I recently read this thread https://www.backyardchickens.com/forum/viewtopic.php?id=158300 were the OP talked about a midget silkie. Should I worry about Pixie?