The segmentation of milk powder is based on the age of the baby. The physiological characteristics and nutritional needs of children at different ages are different, and their needs for nutrients such as protein, minerals, vitamins, fats and carbohydrates are also different. The lower the segment of the milk powder, it means that it is more suitable for newborn infant type of babies to eat, generally three segments of milk powder is mainly suitable for 1-3 years old babies to eat. Babies aged 0-6 months mainly eat the first stage of milk powder; babies aged 7-12 months mainly eat the second stage of milk powder; children aged 1-3 years are recommended to eat the third stage of milk powder; children aged 3 years and above are mainly staple food and can be supplemented with four stages of milk powder. Which stage of milk powder a baby should choose is mainly based on age, but a few babies whose development level does not match the corresponding age, such as premature babies and low birth weight babies, need to choose the right milk powder under the guidance of a doctor. In addition, 1-3 year old babies do not rely on 3 segments of milk powder alone for the intake of nutrients, and need to add supplementary foods, such as noodles, porridge, soft rice and other foods that are easier for the baby to absorb quickly to ensure the growth and development of the baby’s body.