Respiratory syncytial virus (RSV) is an acute respiratory infection caused by respiratory syncytial virus. It is prevalent from October every year to March next year, and all children can be infected at least once before the age of three. In infants and toddlers, symptoms of a cold such as fever, cough, and runny nose occur in the early stages of the invention, and in severe cases, it can lead to lower respiratory tract infections such as capillary sinus pneumonia. Guardians should take a close look at children as they can be reinfected during each epidemic. Respiratory syncytial virus is infected by contact with an infected person, coughing, sneezing, etc. Infants with a short incubation period of 2 to 8 days and weak immunity due to their strong transmission power often develop group infections. Therefore, special attention is needed at postpartum care centers and infant care facilities.