I have a 4 week old chick in the brooder, just noticed it is unable to walk, no pasty butt, but, it's bottom is wet as in runny poop, it is in with six others, any ideas what could be up? They are on medicated chick starter. I got this one out and set it on the floor it just kinda flaps it's little wings and either falls over or moves backwards from wings flapping?