I was feeding my new lamb about half an hour ago and he was fine when he finished drinking but then he started coughing and sneezing softly. His breathing sounds like there should be milk in it but I put a stethascope to his chest and he seems clear. He coughed up a little bit of milk a while ago but I'm worried. A few of my past lambs died from unknown causes and I don't want to lose another. He's lively and running around but he doesn't seem right. Please help!