The purpose of breastfeeding is for the healthy growth and development of the baby. If the growth and development curve of the baby is normal, we cannot give up breastfeeding easily. But if breastfeeding affects your baby’s growth and development, then we should also add formula at the right time. In terms of nutrient content, the nutrients in breast milk decreases from four to six months, and the baby’s development is affected to a certain extent. From four to six months, you should gradually add complementary foods, from less to more, from thin to thick. In general, weaning is more common between the ages of one and one and a half years, and the World Health Organization advocates weaning between the ages of two and three.