We have some 4 day old BO's. One had pasty butt yesterday which was cleaned up, that went well. This morning the same bird (we think) is very lethargic and seems to have labored breathing. We tried to get her to drink and eat. She might have taken a couple of sips, but no food. She just wants to sit. She doesn't move out of the way when the other chicks walk on her. Her eyes and beak are clear. No further problems with the butt. What can we try?