We don't quite know if the small "noises" some of us have heard were actually a minor RI at the beginning, or something else causing the symptom. (maybe a bit of inhaled water or debris? or just due to some physical abnormality they outgrew?) The best thing to do is pay attention- if the tiny sounds increase & you see any symptoms of distress (excess saliva, bubbles, open mouth breathing, etc) then make an appointment A.S.A.P.