My baby is 2 and half month old, we had given vaccine so how many days the fever may persist? Also what is ideal temperature range in this age of baby? When we should consider the temperature as fever?

A. Actually fever can stay up to 20:4 hours to 48 hours but usually subside within 72 hours even after vaccination and if it does not then it is not a normal or vaccination associated fever in that case you need to check with your doctor and below 99°F is actually normal body temperature