Hello! I am new to this site but not to chickens. My husband and I have had a small flock for about 5 years now and we just love them. We have lost some over the last few years and decided to get some new babies this spring. We have an issue that we have never seen before and after days of searching the internet, I still cannot find something that describes the illness two of my chicks are suffering from... These two babies are between 3 and 4 weeks old. One of them was sneezing and seemed swollen in her abdomen a day or so after we got her home. She waddled and sat a lot but continued to eat and drink. I gave her some epsom salt water thinking she was constipated and that seemed to help a little. The other one started sneezing a day or two after that. Now both are sneezing and have swollen crops and I am still not sure what's going on. Their eyes are clear and there is no noticeable discharge from their nose.Their breathing is a bit labored but no coughing. I have had them separated from our other babies for several days now and none of the others are showing any signs of illness. I have them on the duramycin 10 which seems to have helped the one that was worse and swollen but they have been on it for 4 days and still sneeze A LOT. They are eating, drinking, pooping normally, growing and are active. Any idea what could be going on with these two? Also, we were told they were buff orpingtons but I have never had that breed before. Are they this light colored as chicks? Any thoughts, ideas or suggestions are greatly appreciated!