If a baby has a fever after each vaccination, parents should clarify whether the vaccination is given in a healthy state each time, for example, the child does not have a cold or fever, or does not have indigestion such as nausea or vomiting, and the child is also in a state of adequate rest and eating well, and it is not due to a decline in immune function, such as a short-term treatment with oral medication for respiratory tract infections and is currently in a recovery period, or due to A specific disease of the gastrointestinal tract is also a case of recovery from treatment. Children are particularly prone to fever after vaccination if their immune function has declined or during a period of illness. If the fever is not caused by a vaccination in a slightly weakened state, parents usually do not need to worry about it. Usually, in this case, the child’s temperature is not very high and is usually low, so physical cooling is good.