Hi! I'm raising about 20 Cornish rock chicks and its my first time with meat birds. I've raised dozens of laying breeds and never had an issue with sick birds. I noticed yesterday though all of my meat chicks (2 weeks old) are bald on their bellies. I change their bedding often and they are separated from the big girls. Then last night I had one dead when I went out when earlier they all looked fine, other than the baldness. This morning I noticed a little blood in the poops on the floor of the shed. I also have 6 laying pullets that are the same age in with them. Any ideas what's going on? We don't medicate at all, except for holistic meds. Thank you!