if your son is falling sick so frequently, then i think you probably need to find the cause of it.
too much snacks n candies?? not enough sleep n fluids? night time never cover blankie??
all these accumulate to the cause of colds.
fever is actually a sign to tell you something is wrong at some part of your body..
eg, throat infection.
for me, i have fever/cough/flu medicine at home for pin.
1st day of fever, i will give her fever meds, if by next day it doesnt subside, wil bring her to the doc.
as of cough, i will wait 2-3 days to see if it gets better. minimise her snacks n give her more fluids.
if it gets worst, will bring her to the doc.