Since the nutrition of breast milk at around 12 months is not enough to meet the daily needs of babies, so if the complementary food is added smoothly, it can be properly weaned and replaced with formula at around 8-12 months, but if the baby’s complementary food is added late and there is no other source of nutrition, it can be properly extended to 18-24 months. A gradual approach is recommended for weaning to allow the child to have an adaptation process.1. Infants’ own developmental needs: breast milk is the most nutritious food for infants, so if infants are weaned too early and is not conducive to their own growth. However, after 6 months, the infant’s body development accelerates and needs more rich nutritional supplements, and at this time, in addition to breastfeeding, complementary foods need to be added, breast milk can no longer fully meet the baby’s needs, and other foods need to be ingested. If at this time the baby does not add complementary foods, still maintain the dependence on breast milk and refuse to eat other foods, they may suffer from anemia and other malnutrition diseases, resulting in loss of appetite and feeding difficulties; 2, the baby’s digestive system is perfect: with most of the baby’s milk teeth erupted, chewing and digestive system functions such as gastrointestinal, the diet gradually changed to semi-liquid, vegetables and other foods, the variety and quantity also increased significantly, and the formation of Certain nutritional rules to meet the growth and development needs of an adequate supply, as long as the rest of the daily diet has been able to meet the nutritional needs of infants, the time is ripe for weaning, there is no need to keep breastfeeding.