How to fix narrow airway on baby?

Growth: Infant's are born with airways that function as needed unless problems arise. They are somewhat rubbery & with rapid air movement will suck in on themselves, like sucking to hard on a straw.With age they get bigger & stiffer & eventually act more like a pipe.Babies can be born with weak supportive structure or narrower airways.If too bad, a bypass tracheostomy can be used untill growth solves pbm.

Depends: If it is causing problem, then see a pediatric ENT doctor. Most of the time we can reconstruct an airway without doing a tracheotomy, but not always. The surgical reconstruction technique depends on where in the airway the narrowing is (throat, voicebox, windpipe, etc).

Oh, please...: Please, don't do anything to your baby. It's physiological in babies of having short and narrow airways, s/times even floppy. But baby will overgrow it in a near future. You don't have to fix it, unless it causing a serious breathing issues.