Autumn diarrhea vaccine can be administered from July to October. Autumn diarrhea is a rotavirus infection that is prevalent and can be prevented in infants and young children between the ages of 6 months and 3 years old. Rotavirus infections mainly occur in the fall, and the chance of having an attack in other seasons is relatively low. Vaccination should be given from July to October every year to increase the body’s resistance to rotavirus and reduce the number of attacks. The rotavirus vaccine has fewer side effects and does not affect the physical development of infants and young children. When infants and young children are over three years of age, their immune system has gradually improved and they are less likely to be infected with rotavirus, so there is no need to be vaccinated.