Infants with fever after vaccination, according to the degree of temperature, take different ways to reduce heat treatment, find the cause of the disease, and then treat the cause. 1. No more than 38.5 ℃: In general, after the baby has been vaccinated, mainly low-grade fever, can not take fever-reducing drugs, temporary observation. At the same time, give the baby more warm boiled water to drink, the diet should also be lighter, to help reduce fever. 2. More than 38.5 ℃: If the baby is vaccinated with a high fever, the temperature is more than 38.5 ℃, we should cooperate with the professional doctor to carry out antipyretic treatment, taking antipyretic acetaminophen, ibuprofen and so on. If the fever persists, it is recommended to go to the hospital pediatric examination in time to clarify the cause of the disease and timely treatment of the cause. If a baby has a fever after vaccination, consult a doctor if necessary.