Generally speaking, DHA should be supplemented from the beginning of pregnancy to the end of pregnancy, and some scholars suggest that DHA should be supplemented until the end of breastfeeding. DHA can promote the development of fetal nerve cells, especially retinal cells, which is very beneficial to the fetus. It is suggested to supplement it at present.

After pregnancy, you should start taking DHA about 5 months after pregnancy, which belongs to the period when the central nervous system of fetal brain develops fastest. At this time, the demand for DHA is great, because at this time, the mother can supply more DHA to the fetus to meet the development of neurons in the fetal brain and retina. Pregnant women should eat it five to six months after the baby is born. During this period, breastfeeding can also play a certain role in passing it on to the fetus. After 6 months, the fetus can eat complementary food by itself. By feeding DHA and letting the child absorb it directly, the mother can stop eating DHA and let the baby eat it directly to achieve the DHA needed for the baby's growth.

In addition to DHA supplementation during pregnancy, folic acid-based multivitamin tablets and calcium tablets should also be supplemented. Folic acid can prevent fetal malformations, including neural tube malformations, heart malformations and other malformations, and folic acid can also reduce the incidence of maternal hypertension. A variety of vitamins can promote the growth and development of the fetus. Pregnant women often lack calcium and need to supplement calcium tablets.