Thank you for your query on Healthcare Magic.
It seems your child is having a Viral fever
For fever give Tylenol in prescribed dose every 8th hourly depending on the presence of fever.
Give plenty of oral fluids and sips of oral rehydration fluids like Pedialyte
to prevent dehydration
Basic investigation is required with CBP, CUE to know the presence of elevated WBC suggestive of any bacterial infection and to know any urinary infection.
Consult your Pediatrician
for re evaluation and for investigation to know the focus of infection and its treatment.
Hope I have answered your query.