Your son had posterior uretheral valve, it is a congenital abnormality affecting male babies.
PUV's most important complication is UTI (urinary tract infection
UTI normally presents with fever, burning sensation, crying during urination etc.
Fever must be treated with paracetamol
). There is no alternative. If there is increased temperature in a child it may cause fits (febrile seizures
) Paracetamol is harmful for liver when misused. So antibiotics are given to control infection which subsides fever.
You have said he has refluxes too.
It is better you get your child to pediatric surgeon or a nephrologist
They may order some scans to find out his kidney function and provide appropriate treatment.
Since PUV's need life long close follow-up regularly particularly if it is associated with refluxes and recurrent UTI.