Suggest Remedy For Recurring Cold And Fever

Hi, my child is two yearstwo months old. From past two months he is getting fever & cold frequently. Doc says its viral fever and he is having some kind of allergy. Sometimes tempareture will touch 104. Presently he is taking montair and azithromycin antibiotic. After taking these medicines for five days again today he has fever 100. Not able to understand why is it happening like this. Please suggest something sothathe can be fine.