1. Nutritional balance is the key to pregnancy. In the early stage of pregnancy, expectant mothers need to pay attention to a balanced diet and absorb enough nutrients such as protein, carbohydrates, fats, vitamins and minerals. Among them, high-quality protein can promote fetal development, carbohydrates can provide energy to support body metabolism, and fat can provide necessary nutrients for fetal brain development. 2. Appropriately increase dietary fiber during pregnancy