need help

Pease

my son had a slight fever all day done Tylenol or helps but the fever comes back no cough or runny nose just fevers and sleeping a lot can't hold down milk but trys he is holding down water and Pedialyte good. What else can I do for his fever he is 16 months old please help. My niece just got over the stomach flu and I'm afraid he might have it now. The highest his fever has been is 101.4