Thanks for posting your query.
It would be helpful to know if he has any other symptoms like cold, sore throat
, ear pain
, abdominal pain
It could be the start of a usual viral flu or he may have some other infection that requires antibiotics.
For now, you can give him another dose of Tylenol
for children. The dosage should be calculated as 10 mg /kg body weight. If your child weighs 25 kg then he should get about 250 mg of medicine in a single dose.
Give him plenty of fluids to drink.
It is best if he was seen by his doctor to rule out any infection.