Many children will have some reactions after vaccination, such as fever, redness, swelling, itching and red rash at the site of vaccination, etc. This is related to the type of vaccine, the child’s personal constitution and other factors, so parents do not need to worry too much. Vaccination is to prevent some highly contagious, serious harm to the human body of infectious diseases. Some vaccines are various antigens that induce the body to produce antibodies, that is, attenuated bacteria or viruses, when it enters the human body will attack the immune system, forcing the immune system to produce antibodies, so as to achieve the purpose of preventing the corresponding infectious diseases, so after vaccination, the human body’s immune system is attacked, there will be a temporary discomfort phenomenon, such as fever, etc., which is a normal self-protection reaction of the human body. After vaccination, if the body temperature does not exceed 38.5 ℃, no special treatment is needed, pay attention to rest, drink more water, physical cooling can be carried out, the body temperature of 38.5 ℃ or more can be oral antipyretic, symptomatic treatment, and timely contact with the vaccination clinic for the vaccine, in order to get the best guidance, and timely medical treatment if necessary.