If your son was a preemie or has ever been intubated, you need to be particularly vigilant about RSV (though they should have had him on the once a month RSV vaccine shots if he was a preemie). Otherwise, pretty much all kids get RSV in their first few years and experience it as a very bad cold. If your son's breathing does not improve, keep taking him to the doc. Disclaimer -- I'm pretty anti-Kaiser. Don't let the doctors discourage you from doing what you feel is right in your gut. If your son's breathing is getting better, then great. If not, take him back and demand that they monitor him more closely. Does taking him into a steamy bathroom for about 15 minutes help? With croup it would not, but it should with other cold-like illnesses, though I don't know about RSV specifically. Also, I'm surprised they gave you an inhaler instead of a nebulizer for such a young child. Is he able to use the inhaler? I'm assuming they gave him a spacer for it, but if not, be sure to get one. The spacer makes it so that your son doesn't have to time his breath in perfectly with the inhaler to get the albuterol. I hope your son feels better soon.