DHA is not mandatory, but can be supplemented according to individual circumstances. DHA refers to docosahexaenoic acid, and fish, especially deep-sea fish, contains more DHA. Eating more fish, especially deep-sea fish, since mid-pregnancy can provide sufficient DHA for the development of the fetus, and there is no need for additional supplementation. However, when pregnant women do not eat fish or picky eaters, they can supplement DHA under the guidance of the doctor, which is beneficial to the growth and development of the fetus. Diet during pregnancy should be diversified to ensure adequate intake of nutrients to ensure the growth and development of the fetus and the mother’s own needs. Due to the influence of early pregnancy reaction, from the middle of pregnancy onwards, you can appropriately increase the amount of food rich in protein, iron, calcium and other nutrients, such as meat, dairy, eggs, poultry, animal liver, etc., and you can also eat more fresh vegetables and fruits.