I have 3 one week old silkes that have been hatched from mail order eggs. I have a brood hen that has hatched them and mothering all 3 chicks. One of the chicks a few days ago started mouth breathing. I started giving it Polyvisol because I couldn't figure out what else to do. However tonight it has started sneezing. This little baby is under the mother hen so I hate to separate it and stress it out but I don't want to jeopardize my other birds. What do I do? What is wrong? Help!!!!!