Rubbery airways: Infants have rather rubbery airways that will not become stiff like an adults until 8-10y. The result is a musical quality to many of their coughs or giggles that can mimic a seal barking or produce random squeaks and the like.This is all based in the vibrations within the walls of the airways as they move air in or out. A laughing kid who is happily getting your attention is a good sign it is ok.
Answered 9/1/2012
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