I have a two month old baby boy and girl who are both losing hair down their topline. It isn't exactly bald spots. The hair is very short but still there. most of it is where they can't reach so its not from them biting it. I treated my entire herd with Cylence but the boy has continued to get worse. I haven't retreated yet because it has only been a week and a half, not 2 weeks which was recommended for sucking lice. Any ideas?