I have 29 little week old silkies. One of them squeaks like a little bob white when it breathes. It now does this even when it is sleeping. It also shakes its head like in a sneezing motion while making a high pitched squeak about every minute while it is awake. I also just saw he is now opening his mouth while breathing and making this noise. No drainage, eating and drinking normal, eyes are clear. He does have a poopy butt like some of his siblings. Should I be watching for something or could this just be normal for him? Has anyone ever had a chick do this and grow out of it?