Breastmilk has always been nutritious, but as the baby grows older, the nutrients in breastmilk will continue to decline, usually at 6 months, you need to add appropriate complementary foods to supplement nutrition. Breast milk is mainly divided into the following three stages: 1. Colostrum: 1 week after delivery of the milk, which contains immunoglobulins, can enhance the resistance of newborns, promote gastrointestinal tract development. 2. Transitional milk: It is the milk from 7 to 14 days after delivery, with decreasing protein content and increasing fat and lactose content, which is also more nutritious. 3. Mature milk: the protein content is about 2%~3%, fat is about 3%~5%, sugar is about 8%~9%, inorganic salt is 0.4%~0.5%, and a small amount of vitamins. Babies within 6 months should be breastfed as much as possible, the nutrition of breast milk is still able to maintain the needs of growth and development, however, after 6 months, babies need to add complementary foods in time to make up for the reduced part of breast milk nutrition in order to maintain the baby’s normal growth and development needs. If you have any other questions, it is recommended to consult a professional doctor for guidance.