The nutritional value of one-segment milk powder is higher and the proportion is closer to breast milk, which is suitable for infants aged 0-6 months, and after 7 months, they need to drink two-segment milk powder. Infants of different ages require different nutrients for their growth and development, and infant formulas of different segments will be formulated according to their developmental needs. The protein whey protein ratio is relatively high, suitable for the digestion and absorption of small-month-old babies, but the mineral content of nutrients is relatively low, only suitable for the growth and development of infants before the age of 6 months. 6 months later, a section of the milk powder can not meet the nutritional needs of infants, in the addition of the second section of the milk powder at the same time, the parents need to add part of the complementary food, such as rice flour, egg custard, etc. The parents should also add a part of the complementary food, such as rice flour, egg custard, and so on. In addition, because 6-7 months of young children belong to the period of milk transfer, the baby’s gastrointestinal function is lower, the adaptability to new food is poor, need to gradually from the first paragraph of milk powder gradually transition to the second paragraph of milk powder.