Is the chick breathing normally, or does it seem to be struggling or having a clicking sound with each breath? I had a chick the same age that had a ruptured air sac on his right side from trauma. He clicked and was gasping, so I tried to pull the air out. It is similar to a human having a collapsed lung. If he is is tolerating it, just wait for the air to be reabsorbed by the body.
If he is struggling to breathe, you can use a sterile needle and insert it under the skin. You can then press the air out through the needle, or pull it out with a syringe. An 18 gauge needle is used in older birds, but I only had a 22 gauge, so that is what I used. After I got the air out, I held a clean finger over the needle site for several minutes.
I had to repeat this since the air came back. But it finally stopped. The chick almost appeared limp and dead, but it revived in a few minutes. Some have even used sterilized sewing needles in an emergency. Good luck. Here is a video of a vet deflating a ruptured air sac:
If he is struggling to breathe, you can use a sterile needle and insert it under the skin. You can then press the air out through the needle, or pull it out with a syringe. An 18 gauge needle is used in older birds, but I only had a 22 gauge, so that is what I used. After I got the air out, I held a clean finger over the needle site for several minutes.
I had to repeat this since the air came back. But it finally stopped. The chick almost appeared limp and dead, but it revived in a few minutes. Some have even used sterilized sewing needles in an emergency. Good luck. Here is a video of a vet deflating a ruptured air sac: