Rickets is a common nutritional deficiency in infancy and early childhood, also known as chondromalacia, which is caused by abnormalities in calcium and phosphorus metabolism as a result of vitamin D deficiency. When a child has rickets, the first thing to do is to get more sunlight, whether it’s winter or summer, let the child go out and get more sunlight, and open the windows or go out into the yard when the sun is shining. It is also important to get more sunlight during pregnancy and breastfeeding. More sunlight can promote the synthesis of vitamin D, which is of great benefit in safeguarding the supply of vitamin D to infants and children and preventing rickets. Add vitamin D-rich foods to the diet and supplement with some vitamin D medication and supplemental calcium. vitamin D supplementation must be in accordance with medical advice, and vitamin D should be given in advance to premature babies, and if a child has chronic diarrhea or other chronic diseases, it is necessary to inject vitamin D intramuscularly. generally after vitamin D supplementation, calcium absorption will naturally increase with it, and the disease will improve. Treatment of young infants with hand-foot convulsions requires emergency stopping of fright and calcium treatment, followed by vitamin D supplementation. Rickets is contraindicated by taking large amounts of vitamin D preparations for a long time, vitamin D is not a nutritional product, and taking too much can lead to vitamin D toxicity.