Some babies make noises when they breathe!! This usually comes from the upper airways and not necessarily from the lungs. In these babies, they look fine, eat fine, and are happy and active without a problem. This may be the case with your 6-month-old son. It is a good sign that the pediatric pulmonologist did not find anything in your son’s lungs. The ENT may or may not find the source of the noise. I am not sure I would do anything else unless there is a change in your son's appearance, eating, sleeping, activity etc.
You can also telephone the LUNG LINE, at 1-800-222-LUNG(5864) and speak with a LUNG LINE nurse, to get more ideas about finding all the actual underlying causes of your son's problems, so that he can be appropriately treated for these.
Also, you might want to speak with your child's doctor about the possibility of pediatric gastric reflux (which can have several possible causes, including various food sensitivities, indoor air pollution, etc.).
When stomach liquid backs up high into the esophagus, this can cause breathing problems.
You can ask your doctor to speak with a pediatric pulmonologist at Nat'l Jewish, to see what the doctors do there, to diagnose and then help children having pediatric gastric reflux, when the reflux causes breathing problems (in case this may be a factor).
There are many things that can be done to help, if his problems are caused by (at least) pediatric reflux. Good luck to you.
Concerned lady
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