Hello, thanks for the query. H. C. M .C.
In children the opening of urethral meatus is not fully ( may be phymosis (partial).
When opening is not fully then there is pain during urination that point to be noted and please get it check first of all.
I want to make clear that in above mentioned condition usually fever
does not occurs.
However due to pain there may be fever.
Certain drugs are specific for urine infection so you could try these after the consultation of doctor.
Good luck. Dr. HET