Pregnant women can drink milk from the fourth month, because at this time the fetus grows faster and requires more nutrients, in the first trimester, the fetus does not grow particularly fast, the usual daily diet will be able to achieve the nutrients required for the growth of the baby. In the fourth month of pregnancy, the appropriate amount of enhanced nutrition is beneficial to the growth of the fetus, because in the fourth month of pregnancy, the fetus needs calcium and protein fat content is very much, if the pregnant women do not supplement enough, it will easily lead to the pregnant women’s physical weakness, will also affect the growth of the fetus. Milk is rich in calcium and high-quality protein, which can promote fetal bone development and brain development, so it is beneficial to start supplementing milk in moderation in the fourth trimester.