3 year old Grandson health issues

My grandson at 6 months had RSV and hospitalized.  Since then he gets sick nearly on a monthly basis with colds that settle in his lungs and ends up with RSV and/or pnuemonia (pneumonia). This year so far:
January 09 he had double ear infection was on antibiotics.
Feb. 09 he had RSV and pnuemonia (pneumonia) right lung spend night in ICU due low oxygen saturation and he was on antiobiotics.
Mar 09 he has pnuemonia (pneumonia) in the left lung and is on antibiotics.....AGAIN.
He always has a runny nose that eventually ends in colds, bronchitis, or some form of pulmonary problem.

Could there be an underlying cause for this recurring problem and what would your suggestion be for help?  

[asthmamommy]

I am having this same issue with my 15 mo old...we are finally seeing a lung specialist in the next few weeks.