i have a week old chick that has been doing GREAT i had it in with the rest of my chicks that were from a week to two and half weeks old and it did fine, two days after we seperated the older chicks its started acting very sleepy it just sits there when i try to make it walk or move around it seems very shakey like its legs are weak, some of the younger chicks have had pastey butt could this be related? how can i get this chick back up and perky? they have fresh water and eat chick starter