DHA 
 DHA, docosahexaenoic acid, commonly known as DHA, is a human body is very important for the polyunsaturated fatty acids are Omega-3 fatty acids important member of the family. DHA is a nervous system cell growth and maintenance of a major element is an important component of brain and retinal component content in the human cerebral cortex up to 20%, the proportion of the retina in the eye the most, accounting for about 50%, therefore, fetal infant mental and visual development of vital importance 
 Pregnancy, DHA can optimize pyramidal cells of fetal brain phospholipids composition. In particular, at least 5 months after the fetus, the fetus, such as artificial hearing, sight, touch to stimulate the cerebral cortex may cause fetal growth of sensory neurons in the central more dendrites, which also supplies the fetus needs the mother more DHA . 
 DHA to promote the maturation of retinal light perception 
 DHA is not only important influence fetal brain development, but also the maturation of retinal light perception plays an important role. Pregnant women during pregnancy can be rich in a-linolenic acid intake of food to improve the content of a-linolenic acid, the use of maternal serum a-linolenic acid in the synthesis of DHA, and then transported to the fetal brain and retina, where nerve cells to mature degree increase. Therefore, the mother during pregnancy should eat some foods containing DHA (eg, fish), in the last three months pregnant, should eat more and more with a-linolenic acid foods (such as a hard fruit), conditions are available directly from a-linolenic acid with special nutrition maternal nutrition package or DHA supplementation.