Full-term newborns can be given vitamin AD drops for two weeks after birth, which is about half a month. The main ingredients in vitamin AD drops are vitamin A and vitamin D. Supplementing the body with vitamin A can increase the immunity of the baby’s respiratory tract and can prevent night blindness. Vitamin D, when taken into the baby’s body, can promote the absorption of calcium and the deposition of calcium in the bones. Low calcium treatment needs to be taken together with calcium supplements in order to have a better effect on correcting low calcium. Vitamin AD is fat-soluble and can be taken in the morning or at noon, after the baby has finished breastfeeding for better results. The gastrointestinal function of newborn babies is still relatively weak, the body’s digestive ability is relatively poor, if the night before bedtime to the baby, may affect the absorption of the drug, so should be avoided at night.