The average breast milk intake of pure breast-fed infants from 0 to 5 months of age in China is 800.1 g/day, and the complementary food sources of infants from 6 to 23 months of age are high in protein and low in iron and zinc. Recently, the Institute of Nutrition and Health of the China Center for Disease Control and Prevention reported the data of the "13th Five-Year Plan" basic resource survey special project of the Ministry of Science and Technology, "Investigation and Application of Nutrition and Health System of Children from 0 to 18 Years of Age in China" for the first time. Yang Zhenyu, a researcher at the Institute of Nutrition and Health of the China Center for Disease Control and Prevention, said that nutrition in infancy is the basis of health in the whole life cycle. Insufficient or excessive dietary intake is the main cause of malnutrition. Food intake assessment can identify early malnutrition and provide important scientific basis for nutritional intervention. According to the introduction, this survey and study analyzed the breast milk intake of infants aged 0 to 5 months and the complementary food energy and nutrient intake of infants aged 6 to 23 months in China, providing the latest information for promoting the innovation and development of breast milk and complementary food assessment technology in China. The survey results show that in terms of infant breast milk intake, the average breast milk intake of pure breast-fed infants from 0 to 5 months old in China from 2019 to 2021 was 800.1 g/day, and the average number of breast-feeding in 24 hours was 8. Breast milk intake increased with the increase of age, and remained stable at 5 months. Except for individual months of age, breast milk intake of infants from 0 to 5 months of age in different regions and sexes is similar. The introduction of formula powder or complementary food directly affects the breast milk intake of infants within 6 months of age. In terms of complementary food energy and nutrient intake, from 2019 to 2021, China's daily complementary food energy sources for infants and young children aged 6 to 8 months, 9 to 11 months, 12 to 17 months and 18 to 23 months were 156.1 kcal, 258.0 kcal, 388.7 kcal and 581.1 kcal, respectively. Compared with the recommended value of complementary nutrient density of the World Health Organization, the protein density of complementary foods for infants aged 6 to 23 months in this investigation is higher, and the iron and zinc density of complementary foods for infants aged 6 to 8 months and 9 to 11 months are lower. (Outlook New Era)