Thank you for your query,
Your child seems to have a Viral fever
and in the initial course , the fever will be high grade and it will be continuous.
So give Tylenol
every 4 to 6th hourly depending on the presence of fever in prescribed dosage and do tepid sponging with lukewarm water if there is high grade fever.
Give plenty of oral fluids and soft diet
to maintain hydration and nutrition.
Consult your Pediatrician
for complete examination and basic evaluation to look for any concerning signs and for appropriate management.
Hope I have answered your query.