My cuckoo Maran is sneezing very frequently and doing the yawning thing. Luckily, I've been through this, but with older chicks last year when my SS knocked the waterer over night and got wet. I've been treating with vitamins and probios. It seem to bring the sneezing down, it took a few days. Now one of the other chicks is yawning a lot, but not sneezing yet. I put the probios in wet mash and give a drop of poly vi sol vitamins without iron down the beak twice a day. Morning and night. This is what saved my chicks last year. My SS was so sick she could not stand. The vitamins is what saved her. It was the most stressful time, I did not want to lose her. I also gave her antibiotics, which I'm not doing this time around. I've seen the chicks come straight from the factory sick last year when picking out a flock for my neighbor. They opened the new shipment and there were sick chicks in there. Perhaps they were over crowded in shipment or at the factory. I hope they all make it. I love the new three I brought home this year. Here they are sleeping on my lap. Here they are this morning in the brooder.