If pregnant women drink milk during pregnancy, both pure milk and sour milk without additives can be consumed. In terms of nutritional value, there is not much difference between the two, which contain a lot of vitamins, proteins and calcium, which are beneficial to the growth and development of the fetus, and pregnant women can choose according to their personal needs. During pregnancy, especially in the middle and late pregnancy, the demand for calcium is relatively large, if calcium deficiency occurs, leg cramps, back and leg pain, joint pain, etc., and even affect the fetal bone development, according to the Dietary Guidelines for Chinese Residents, it is recommended that pregnant women in the middle and late pregnancy can consume 250-500ml of milk daily, in 250-500ml of milk contains about 300mg of calcium, accounting for about the middle and late pregnancy The recommended intake of calcium is about 1/3-1/4 of the recommended intake of calcium, which is difficult to achieve with other kinds of food. When choosing milk, both plain milk and sour milk are usually good choices, but it is recommended to choose those made by regular manufacturers and within the shelf life. It is not recommended to choose untreated fresh cow’s milk, which may carry bacteria, viruses or parasites, and you should try to choose pasteurized milk, which is relatively safer and does not affect the taste of the milk. Some milk with additives or flavored milk should also be avoided to prevent the additives from having an adverse effect on the mother and fetus. In addition, although sour milk is more easily absorbed than plain milk, pregnant women who are sensitive to the probiotics in yogurt are advised to drink plain milk to avoid gastrointestinal reactions such as diarrhea and bloating after drinking yogurt, and severe diarrhea may even affect the stability of the fetus. And pregnant women who have lactose intolerance can choose to drink sour milk. In addition to milk, pregnant women can also eat more fresh fruits and vegetables, as well as high-protein meat and fish during pregnancy and delivery, which is also conducive to balanced nutrition for pregnant women and promote the growth and development of the fetus.