How does 3 months child have a fever to do after hitting white to break

Three months after the baby hit the vaccination fever phenomenon, mostly immune function is too strong, the fever reaction to the vaccine, if the temperature does not exceed 38.5 degrees Celsius, can not be treated, drink more water, more rest, generally more will slowly subside. If the temperature is too high, it is recommended to find out the specific cause of the hospital, give antipyretic treatment.