Just brought home 3 Langshans and 2 BC Marans, all 9 days old. 4 look/act healthy, but 1 had a pasty butt that I cleaned off (and it promptly emptied out more! normal, not icky/diarrhea). That chick is not as active as the others, is uncoordinated in its movement (falls on side occasionally, wings out, can't get up very well) and seems to sleep more than the others. Its eating and drinking and pecking some, but just not up to snuff with the others. Any suggestions what this could be, and what to do for her (and prevent spread to others)? Thanks for any advice!