Vitamins can be taken by infants, who are prone to vitamin D as well as vitamin A deficiency. When children suffer from vitamin D deficiency, they often develop vitamin D deficiency rickets, which can cause a series of symptoms such as pillow baldness, chicken chest, and poor night sleep. In addition, children with vitamin A deficiency will often experience decreased dark vision at night, weak respiratory resistance, and very dry skin, so it is important to supplement infants with vitamin AD drops in a timely manner. In addition, some infants may also have vitamin C deficiency, vitamin B deficiency, etc., should follow the doctor’s advice, according to the child’s specific situation appropriate supplementation.