BRONCHIOLITIS 7 months

Iyobosa
My son is now 7 months at 2 months he was hospitalised for 5 days for Bronchioliti, at 7 months again the same problem.
The doctor can not tell me the cause of the Bronchioliti 
My house doctor think that is GERD A REFLUX PROBLEM.
Am really tired, can somebody help me any advice
Is any one going tru the same problem?