So, I went out into the coop today and noticed one of my Black Austrolorps is puffed up, looking miserable and wheezing slightly, sneezing frequently. I don't see any discharge from sneezes but she was kind of breathing with her beak open for a little bit before settling back into just breathing from her nares. She isn't moving around much and is kind of sitting there looking like an uncomfortable lump, blinking long blinks and keeping her eyes closed at times. Her crop has contents. These are my first chickens and around 9 weeks of age. One thing I noticed right away when getting my birds as day old chicks is they were always occasionally sneezing. I used pine bedding. The coop they have now is sand and a bit of DE mixed in. I'm working on the run so they don't get a lot of outside time these last couple weeks. One of the other chicks is sneezing frequently but otherwise active and normal. Most chicks sneeze a little. They recently switched to meat bird feed, as I was running out of medicated and wanted off medication and the chick feed at the store was all medicated. Help! My babies are very tame and very much pets. She was acting completely normal yesterday and was crowding around, begging for treats with the rest of them when I opened the door.