Children should take vitamin AD because vitamin A as well as vitamin D deficiency can occur before children are three weeks old, and after vitamin A deficiency occurs, it can cause dry skin as well as night blindness. When vitamin D deficiency occurs, children develop vitamin D deficiency rickets, causing symptoms such as more sweating, occipital baldness, X-leggedness, and O-leggedness. Vitamin A and D deficiency can affect the health of children, so children need to be given vitamin AD supplements about 2 weeks after birth, which will reduce the probability of vitamin A and D deficiency and help the health of children.