Hi, I am new to raising chickens but my 13 yr old daughter wanted to. So we thought we would give it a try. We incubated 36 eggs and hatched 17. One died after 3 days. All were doing great but one started breathing hard after about 4 days. She has done this for 3 days now. My vet said try tylosine, went to the local mill and it was $50. The lady at the store said she gives her chickens Penicillin. I'm a nurse and thought I could do that. I gave it an injection of less than 0.1ml with a TB syringe in the thigh. NOW she barely uses that leg. Has any one ever experienced this? I have read alot of the posts about how they usually won't make it but I have to try (with in reason) to help her. She eats some, drinks some, poops a little but now I think I have made it worse. I'm a little scared of giving the injection in the breast, but I can't do it in her leg again. HELP!!!!