Pregnant women should be reasonable supplementation of DHA. DHA is docosahexaenoic acid, is an essential poly-saturated fatty acid, DHA is the human nervous system, cell growth and maintenance of a major substance, so that the brain and retina of the important components of the fetus’s intelligence, vision development plays an important role. Pregnancy should be a balanced diet, balanced intake of a variety of nutrients, moderate intake of food containing DHA, such as fish oil, nut foods, vegetable oils or additional supplementation as prescribed by the doctor. Pregnant women should eat a light diet, eat small and frequent meals, such as fresh fruits and vegetables, soy products, etc., and consume enough carbohydrates and foods containing folic acid. If you need to take additional DHA supplement, you need to take reasonable supplement under the guidance of your doctor, and do not use it on your own to avoid causing adverse reactions.