I have three chicks: 2 turken pullets, and 1 white leghorn cockerel. They are around 3 weeks of age. Ever since they were little chicks, I noticed that the white leghorn chick would occasionally sneeze, but thinking that it was just dust in the shavings of food, I did nothing. Yesterday afternoon, I noticed that he was sneezing frequently, and when I picked him up, he got stressed out and I could hear him breathing. That night, I put Braggs Organic, unpasteurized apple cider vinegar with the mother in their water. Today, he did not sneeze very much, but if he gets stressed at all, he begins breathing heavily. I opened his mouth, and it appears that there is mucus around the windpipe. The mucus is clear, and very rarely do I see anything coming from his nose. I would really like to help the chick get better, so do y'all have any suggestions?