Vitamins are a class of nutrients indispensable to the human body, although it does not provide energy, the body’s need for it is very little, but it is the composition of the body of a variety of enzymes auxiliary components, involved in regulating human metabolism, once the body deficiency or lack of, it will affect the growth and development of children, endangering health. Infants and young children often suffer from one or more vitamin deficiencies due to low intake, food monotony or disease factors, manifesting poor appetite, gastrointestinal discomfort, emotional abnormalities, easy to catch a cold or vitamin deficiency diseases, such as: vitamin D deficiency rickets, vitamin B2 deficiency caused by mouth ulcers, tongue inflammation, stomatitis, and so on. For a long time, vitamins were often used as auxiliary medication in the diagnosis and treatment of internal diseases. With the recognition of the relationship between vitamins and health, especially in children’s health care, the need for early prevention of nutritional diseases and protection of children’s health was emphasized, and it was specified in the norms for regular check-ups of children in pediatric insurance that cod liver oil (vitamin AD) and calcium supplements should be started for infants half a month after birth. Especially during the long winter months when children have little opportunity to go out in the sun, nutritional rickets can easily occur if vitamin D is not supplemented on time. Vitamin AD is fat-soluble, and there are currently ten water-soluble vitamins identified, except for vitamin C. The other nine are known as B vitamins, and it has been proven that an additional daily supplement of appropriate multivitamin preparations can enhance the health of children. In the child health clinic, in the face of many problems such as anorexia, diarrhea, anemia, etc., the doctor, through a survey of the number and variety of foods normally consumed by children and a simple test of hemoglobin, got a preliminary understanding of the baby’s nutrition and growth, and found that many parents had done trace element measurements and did not think there was a calcium deficiency, so they did not routinely take vitamin D, etc., resulting in rickets bone development deformities (chicken chest funnel chest) “There are also non-pediatric clinicians who do not know the content of the child health care routine and casually tell parents to postpone vitamin D supplementation, resulting in the consequences.