The fetus develops rapidly in the middle of pregnancy, and the demand for nutrients will increase, so it is necessary to increase fish, poultry, eggs, lean meat and other high quality proteins appropriately, about 50g of these high quality proteins per day. fish is rich in DHA, which is beneficial to the fetus’ brain and retinal development, and it is best to consume deep sea fish 2-3 times per week. The fetus’ demand for calcium increases in mid-pregnancy, and an appropriate increase in daily milk intake can be supplemented with calcium. To eat iron-rich food often, you need 20-50g of red meat every day, eat animal offal or blood clots 1-2 times a week, and pay attention to increase the intake of foods high in dietary fiber, which can prevent constipation and lower blood sugar.