Thanks for your query.
Since your child is having fever
for past 5 days i suggest you to get him examined by pediatrician
as he need some basic investigations like CBC,urine routine and culture,blood culture
to rule out any infection.
In the meantime record temperature every 6 hourly and give paracetamol
if fever is more than 100F.
Do tepid sponging if fever is above 102 F.
Continue giving plenty of fluids and soft bland diet so as to maintain hydration and nutrition.
Wishing your baby good health.