We just got six baby chicks and after a couple of days I noticed one not doing so good so we kept an eye one her and then she went down hill and we had to cull her. Then another started looking really bad. We separated this one from the rest and kept an eye on her. We even kept her in the house for the night and she got stronger. She is now back with the rest and they are all doing great. Now I'm thinking that since the first one was the smallest she was last in the pecking order and wasn't getting enough food. I feel so bad for not realizing it at the time. All I thought was that she was sick from a disease. I feel horrible.