It is advisable to take DHA in the fourth month of pregnancy. this is a kind of brain gold, which has a good auxiliary effect on the growth and development of the fetus, especially it can stimulate brain cells, promote brain cell development, and has a good effect on the intelligence of the baby after birth. dha is an important element for the maintenance of cell growth in the nervous system, which can participate in the extension and formation of nerve cells, and can maintain the Normal physiological activity, involved in the process of brain thinking and memory formation. It is also able to promote the production of retina by supplementing DHA, which has a vital role in fetal intelligence and vision, especially the right amount of DHA supplementation, which has a very good auxiliary effect on fetal learning and intelligence in the future. It is best to start supplementation in the fourth month of pregnancy and eat until the baby is born. If the baby is breastfed after birth, the mother should continue to take DHA, and the baby can eat supplemental food in the process of the mother stop taking it and let the baby start eating.