It is not necessary to take DHA during pregnancy, but you can add it at your own discretion according to your financial condition. Some current studies show that DHA plays a very important role in fetal and infant brain development and retinal development, but research is inconsistent across countries, so there are no clear guidelines recommending that DHA must be supplemented during pregnancy. Supplementation of DHA during pregnancy is not recommended or opposed, however, according to current research, supplementation of DHA during pregnancy is safe and harmless, and the decision to supplement can be made according to one’s own economic conditions after 20 weeks of pregnancy and during infancy. In addition, the Chinese Nutrition Society also suggests that DHA can be supplemented during pregnancy by consuming deep-sea fish 2-3 times per week and 1 egg per day.