Have some bottle calves for kids and friends young kids to show at county fair this year. Got one about 3 weeks ago that looked good and strong and has been sucking the bottle good until the last 3 days. He is always eager to come attack the bottle like they do and he starts off sucking. about 3/4 the way through he quits and starts hacking/coughing/weezing and breathing heavy. Would eventually finish the bottle off. Thought he was drinking too fast maybe so I put a different nipple on for this morning that had a smaller opening and he barely started in sucking before it happened. THis time he looked really bad doing it went and laid down so went to get him up and he would hack up some clear/milky flem out his mouth - nothing out the nose - so I don't think he's getting it in his lungs, but could he be or is it something else?? Not sure, looking for advice from some wise folks here that have seen it all, hate to see a calf die on a little kid. Thanks in advance!