Rickets is primarily caused by a deficiency of vitamin D, leading to a disturbance in calcium and phosphorus metabolism in the body, which results in abnormal bone development. It is a systemic nutritional and chronic disease. The main treatment is to supplement a sufficient dosage of vitamin D, generally administered orally. The choice of vitamin D formulation, dosage, duration of treatment, whether it is administered once or multiple times, and whether supplementation is oral or intramuscular, should be determined based on the specific situation of the child. Relevant tests are generally required, and the doctor will develop a treatment plan based on the child's condition. The route of administration should also be decided based on the condition of the disease.