Most infants do not have any reaction to the oral rotavirus vaccine. A small number of infants may have symptoms such as diarrhea, vomiting, and low-grade fever. Rotavirus vaccine can effectively prevent rotavirus infection or reduce the severity of illness after an attack. Most infants do not have any adverse reactions after vaccination, but a small number of infants may have symptoms such as diarrhea, vomiting, and low-grade fever, but these symptoms do not last very long and are relatively mild. If an infant develops diarrhea, low-grade fever and other adverse reactions for a longer period of time after oral administration of rotavirus vaccine, which affects the normal appetite and mental state, it is recommended to go to the hospital in time to conduct relevant examinations to clarify the cause of the disease and then actively treat the symptoms.