fever

Mummies, if your child at 2 months is having fever (37.5 and above), do you bring them straight to the hospital or wait it out ? My son is currently having fever only at night for the past 3 days as high as 38.5 but goes back to normal in the morning . Should i bring him to the hospital now ? My mum says it normal for them to have fever as they are growing but should i be concern ? Help me out here .