how long normal fever last in babies of 8 months? my baby is having a fever of 100.F

A. first of all depends on the cause of fever. baby s head , soles and stomach can be warmer than rest of the body and its totally normal and is due to hyper dynamuc circulation. Always measure baby s temperature by thermomtr at armpits. If above or 100 farenheit then it s called fever in babies. Give calpol and also if above 102 then start cold sponging. As fever is a sign of body s immune system s  fight against infection so if fver stays for more than 3  days then u hav to see doctor to knw abt infection