Vitamin AD drops for newborns are extremely important and should be taken daily from 14 days after birth for full-term infants and 1 day after birth for preterm infants until they reach 3 years of age, usually recommended to be taken orally in the morning while eating. For newborns who are physically breastfed or formula-fed, the intake of vitamin A and vitamin D cannot meet their daily needs, so they need to take oral vitamin AD drops for supplementation, also known as cod liver oil. Vitamin A can maintain normal visual function and prevent night blindness and vision loss. Vitamin D prevents rickets, poor visual development, decreased immunity, and respiratory disorders. Cod liver oil is usually recommended for supplementation until the age of 3, after which children spend significantly more time outdoors and receive adequate amounts of sunlight for vitamin AD drops. In addition, cod liver oil should not be put directly into the mouth when newborns take it. The contents of the softgel dropper need to be dripped into the infant’s mouth after opening the mouth, while long-term overdose is not recommended to avoid symptoms of chronic toxicity.