DHA, or docosahexaenoic acid, is an essential polyunsaturated fatty acid. It is necessary for pregnant women to take DHA supplements during pregnancy, but they should take them as prescribed by their doctor. DHA is one of the building blocks of the human brain and the retina of the eye. When there is not enough DHA in a pregnant woman’s body, it may affect the development of the fetal brain and eye. Timely supplementation of DHA by pregnant women can promote the development of fetal brain and vision. Pregnant women may choose to start taking DHA after twenty weeks of pregnancy because the fetal brain develops faster during this time and the demand for DHA will be higher. In addition, you can continue to take DHA during the breastfeeding period after delivery and feed it to your newborn through breast milk to promote the development of the newborn’s sensory nerves such as hearing and vision. Pregnant women should take DHA under the guidance of their doctors, and they can also ensure the intake of DHA by consuming deep-sea fish, such as salmon, sardines and herring, as appropriate.