It is well known that immunization is the most economical, easy and effective means to prevent and control infectious diseases in children. Newborn babies who are full-term vaccinated may have fever reactions within 1-3 days after the vaccination, and fever usually appears around 3 days, because fever reactions are more common. The fever caused by the vaccine is generally not too high, at about 38℃. Physical cooling can be taken to lower the temperature. The baby must drink more water to speed up the body’s metabolism, avoid crying, pay attention to more rest, and not take a bath within 24 hours.