You have to give only paracetamol
and liquids to your son.
Paracetamol is given in the dose of 15 mg per kg of weight in one dose.
You can give this dose 4 times a day.
Since your child is 23 kg,you have to give appox 350 mg four times a day.
A syrup containing 250 mg per 5 ml can be given in a dose of 7 to 7.5 ml four times a day.