I often hear reports that giving vitamin AD to babies can be poisonous, and I am too scared to give it to my baby. So is it possible to poison your baby by taking vitamin AD? How should it be taken correctly? Vitamin A is an indispensable vitamin for the human body, it has many functions: 1. Vitamin A in the retina of the rod cells and optin synthesis of retinopathy and optic cyanoplasm, sensitive to low light, in the dark when seeing things, therefore, the lack of night blindness; 2. protect the integrity and soundness of epithelial tissue structure, lack of skin and mucous membrane keratinization; 3. promote the development of bones and teeth; 4. 4. has the effect of promoting the development of immune organs and improving immunity. The current application of vitamin AD preparations, the ratio of vitamin A and vitamin D is 3:1, one AD pill contains 1500 units of vitamin A and 500 units of vitamin D. The preventive amount of vitamin A for infants and children is 1000~1300 units. There are only adverse reactions if 50,000 units of vitamin A (about 40 times the equivalent preventive amount) are taken for a long time. Therefore, it is safe to take vitamin AD pills, and vitamin D pills alone, which cause vitamin A deficiency, will be detrimental to the healthy development of infants and children.