In general, full-term newborns do not need to supplement DHA, because breast milk is rich in DHA, and can be supplemented if preterm babies or mothers are undernourished. The intake of DHA after the birth of full-term newborns is mainly through breastfeeding, breast milk is rich in DHA. DHA can promote the development of brain cells, enhance brain power, help the retinal cells to mature, and promote the development of vision, lactating women can eat more deep-sea fish, shrimp, DHA-rich foods, to provide newborns with a rich supply of DHA. If it is a premature baby, maternal nutrition is insufficient, is the need to supplement DHA, due to premature babies detached from the mother, the development of various organs of the body is not perfect, the body can not synthesize their own, appropriate supplementation of DHA is conducive to brain development, enhance immunity, to help the retinal cells mature. DHA supplementation should be based on the baby’s own condition, and under the guidance of the doctor, choose the appropriate dosage.