Thank you for your query on Healthcare Magic,
As your child is had fever for the past three weeks, basic evaluation like CBP,malarial parasite, widal test
, CUE, blood and urine cultures to be done to find out the focus of infection.
If CUE is suggestive of any infection you can go for ultrasound
or depending on physical examination.
For fever, continue Tylenol
in prescribed dose and give plenty of oral fluids to maintain hydration and adequate urine.
Hope I have answered your query.