Generally babies do not need additional vitamin supplements when they are newborns. Vitamin A can usually be supplemented after two weeks of life, and vitamin D supplementation can be started within a few days of birth. After the baby is born, the food is relatively single, often simple breastfeeding or formula feeding, often can meet the needs of the baby’s growth and development, do not need additional vitamin supplementation. However, with the growth and development of the baby, their own synthesis of vitamin D is insufficient, it is easy to vitamin A and vitamin D deficiency, so generally after two weeks of life can be supplemented with vitamin A, a few days after the birth of the start of supplemental vitamin D. Generally take cod liver oil or vitamin AD drops and so on. After the birth of the baby, should be directed by the doctor to supplement vitamins, parents should not give their babies to supplement at will.