Any Moms here with infants that had RSV?

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A few months ago my son was diagnosed with RSV. He is now on a inhaler (which bothers me because he is only 9 months old) but anyway... my question is... what causes RSV?? I have read different things about it online and really all I have found is that it is more common in babies that were premature. But my son wasn't premature! He was actually very big and healthy! So are there any moms on here that have dealt with RSV?