Normal full-term newborns from birth about 2 weeks after the start of routine supplementation of vitamin AD, need to continue to supplement until 2-3 years of age, vitamin A to improve the child’s immunity, bone development, vision development are beneficial; vitamin D is mainly to promote calcium and phosphorus absorption to prevent rickets, laryngeal cartilage hypoplasia and other diseases. Vitamin D needs to be supplemented 400IU per day, Chinese infants also have insufficient vitamin A content in the body, and need to supplement vitamin A at the same time, in order to avoid the accumulation of vitamin A in the body, vitamin AD is recommended to discontinue after 2 weeks of oral administration for 1 week and then continue to take. When the child is combined with preterm labor, low birth weight, laryngeal cartilage insufficiency, the oral dose of vitamin D needs to be increased.