Children before the age of one are generally not advocated to drink pure milk, try to breast milk, or formula. Pure milk after 1 year old children can drink. Because the protein content of pure milk is relatively high, it is based on large molecules of casein, is not easy for small children to digest and absorb. The unsaturated fatty acids in milk are less, the fat globules are bigger, and the children’s body lacks lipase. Milk also has alpha lactose, which has a large molecular weight and is not easy to reach the colon of small children, which is not conducive to the growth of probiotics. The ratio of calcium to phosphorus in cow’s milk is 1:1, which is not suitable for the growth and development of babies. Generally, the ratio of calcium and phosphorus in breast milk is 2:1, which is better absorbed. At the same time, the osmotic pressure of milk is relatively high, easy to increase the burden on the baby’s kidneys. If your child is not breastfed enough, you should choose a formula that is more similar in composition to breast milk rather than cow’s milk. After one year old, with the development of the child’s digestive tract, you can start and pure milk, and this time milk is no longer the only same milk source, so the milk formula requirements are not high, you can drink pure milk in moderation.