Supplementation of protein, calcium, iron, vitamins, iodine and other nutrients in mid-pregnancy can be done by adjusting the diet under the guidance of a doctor. 1. Protein: As the growth of the fetus accelerates from mid-pregnancy onwards, the need for protein increases, so it is necessary to appropriately increase foods rich in high-quality protein, such as meat, dairy products, eggs, poultry and fish. 2. Calcium: almost all the calcium needed for fetal bone development comes from the mother’s body, so it is necessary to appropriately increase the intake of dairy products, at least 250-500g of dairy products per day, and follow the doctor’s advice to supplement calcium supplements. 3. Iron: fetal growth and development will require more and more iron reserves, to appropriately increase the intake of iron, such as eating more red meat, when it is clear that pregnant women combined with anemia, but also need to follow the doctor’s instructions to supplement iron. 4. Vitamins: appropriately increase the intake of fresh fruits and vegetables to ensure that the growth and development of the fetus needs to be met. 5. Iodine: Under the guidance of a doctor, the intake of iodine can be appropriate, if the combination of thyroid disease pregnant women need to be evaluated by an endocrinologist to assess the need for food iodine supplementation.