Sounds like coccidiosis. Is he all fluffed up and not eating her chick feed? Or drinking water? If she looks like this, and you are seeing dark red or black poop in the brooder, they probably have cocci which can kill them. You might go to the feed store and get some Corid to put in the water for 5 days. This will help with the cocci. So sorry about your baby. I hope she gets well soon.

