Rotavirus vaccine needs to be administered 3 times, but it is usually given orally. Rotavirus vaccine is usually given in August-October each year, and the specific vaccination procedure needs to be carried out at different times for infants and children. The rotavirus vaccine is generally indicated for infants and toddlers from 6 months to 5 years of age. The first dose can be given at 6-12 weeks of age, and the second and third doses need to be given 2-3 months apart. Because rotavirus is more prevalent in the fall and winter of each year, the chances of contracting rotavirus are also greater during this time of year, and vaccination is recommended from August to October each year. The rotavirus vaccine is usually given orally without a needle injection, and antibodies are produced 2-4 weeks after vaccination, and the concentration of antibodies increases with time. Rotavirus vaccine is a vaccine to prevent rotavirus enteritis, a serious disease that endangers children’s health and is highly contagious, but the protection period after oral administration of live rotavirus vaccine is generally one year, and the longest period is not more than one and a half years.