Rickets is prevalent in children, but with the improvement of living standards parents’ knowledge of childcare, the incidence of rickets has been reduced a lot. 1, insufficient sunlight exposure: only on the basis of ultraviolet radiation, the skin can produce enough vitamin D. And the amount of vitamin D is proportional to the intensity of ultraviolet light, the duration of exposure and the exposed area of the skin. 2.Insufficient intake of vitamin D: This is mostly seen in children who did not eat dairy products containing vitamin D before the age of two or who were breastfed but did not supplement cod liver oil in time, especially in children who develop rapidly, which can easily lead to micronutrient deficiencies, which can lead to rickets if supplementation is not timely 3.Insufficient absorption of vitamin D: If vitamin D supplementation is in place, then the absorption link The problem will also lead to rickets, which is more common in the case of chronic celiac disease, liver, biliary, pancreatic and other diseases of the population. The above is a detailed analysis of the causes of rickets, for children to timely supplementation of vitamin D is very critical. Of course, there are also some special disease states that can cause the disease to occur, and need to be guided by a doctor