Vitamin D deficiency rickets (rickets for short) is one of the “four major diseases” in pediatrics, and the typical symptoms of rickets osteolysis in infancy and childhood have been familiar to parents. However, late-onset rickets (also known as adolescent rickets) is often overlooked, resulting in delayed diagnosis and treatment, affecting the health of young people. 1, lack of nutritional knowledge Parents lack of nutritional knowledge, when adding food for infants, too much attention to high sugar, high protein and high calorie food on the child’s nutritional role, resulting in children’s partiality, picky eating, resulting in the body of vitamin D and other micronutrient deficiencies. Especially young children in affluent families, favor chocolate, ice cream, cake and other high-sugar foods, but also cut off the source of vitamin D intake. Recipes are too narrow is an important cause of rickets osteolysis in young children. 2, outdoor activities are very few urban high-rise buildings, so that the lack of activity places for children; too early in the “seedling” type of early childhood education, so that the loss of outdoor activities time; parents due to family disputes, work relationships and economic constraints and other reasons, let the children live indoors for a long time; informal child care institutions, so that many infants and young children in the long term in the indoor; and less see the sun; and less than the day; parents due to family disputes, work relationships and economic constraints, so that children live indoors for a long time. And less see the sun; for fear of children out sick or out of danger, so that children’s outdoor activities are reduced, these conditions and sunlight contributes to the body’s vitamin D production is reduced and prone to rickets osteolysis. 3, the increase in the abuse of drugs due to the reduction of breastfeeding, partiality, picky eating and outdoor activities, infants and young children have declined in physical fitness, resistance to disease is also relatively weakened. Therefore, children’s upper respiratory tract diseases and intestinal diseases appear the chance of greatly increased. In fact, many infants and young children are often in diarrhea – nutrient malabsorption – physical decline – diarrhea in a vicious cycle. These children are also commonly found in families that are better off and take injections and medications for minor illnesses. Therefore, the abuse of therapeutic drugs, especially for a longer period of time using antibiotics, antacid drugs, sedatives and anticonvulsants, aluminum hydroxide, antidiarrheal drugs and some of the clearing of heat and other drugs, affecting the normal metabolism of children’s bodies, especially affecting the normal absorption of bile acids to vitamin D2 and D3, so easy to lead to the emergence of rickets osteolysis.