Calcium supplementation during pregnancy should continue until after the fetus is delivered. After the rapid development of large organs in the fetus in the early stage of pregnancy, the fetus enters the middle stage of pregnancy after the fifth month of pregnancy, which is a period of rapid development mainly for the development of the skeletal system, and the fetus continues to be in a period of rapid skeletal development until after birth, even in the first six months after birth. Therefore, calcium supplementation during pregnancy should be continued until the fetus is delivered. Pregnant women can adjust the amount of calcium supplementation by monitoring obstetric ultrasound to assess the length of the femur, tibia, and head circumference of the major fetal limb bones. Calcium levels can also be controlled by adjusting the structure of the diet to ensure healthy fetal growth. For pregnant women with mild vomiting, it is recommended to ensure that 300-500g/d of milk is consumed continuously until the fetus is delivered. In addition, although various dairy products such as liquid milk, yogurt and milk powder for pregnant women can be used as a source of calcium supplement, the calcium content of dairy drinks is usually not high and therefore not recommended as calcium milk supplement. Meanwhile, pregnant women can supplement calcium from food by increasing the consumption of nuts, dark leafy green vegetables, light-colored vegetables, and soy products.