I understand  ur concern for ur child. It is moderate degree of fever of short duration. &is apparently not having associated complication. Please give him plenty of oral fluids &syrup paracetamol 12 ml every 4 hourly if his wt is about 20 kg &fever remains more than 101.avoid paracetamol if child is having fever less than100 degrees Fahrenheit. Please document fever every 4to 6 hrly. Please take to doctor if he develops fever more than 104,altered sensorium,rash,convulsions ,breathlessness or bloody diarrhoea.