Self-funded quadrivalent influenza vaccine is recommended for children aged 3 months to 3 years according to the National Vaccination Program. Because of the serious consequences of influenza virus infection, individual patients may die. For those who have indications for vaccination, it is recommended to receive Quadrivalent Influenza Vaccine, even if self-paid. After vaccination, the body produces specific antibodies, which can effectively prevent infection or reduce symptoms and complications after infection, and it is recommended that children be vaccinated in accordance with the national vaccination program for children. Some children may have vaccination reactions after vaccination, such as skin rashes and localized hard nodules, etc. Usually, they will disappear soon after proper rest and symptomatic treatment; those with serious or persistent unrelieved adverse reactions need to seek medical treatment.