Pediatric rickets focuses on prevention Pediatric rickets (commonly known as calcium deficiency) is a common nutritional deficiency in pediatrics, which predisposes children to bone deformities, pneumonia, diarrhea and other diseases, and also affects sleep quality and motor development, seriously affecting the healthy growth of children. Generally, infants within 1 year of age are the most prevalent age, mainly due to rapid growth and development at this time, requiring a considerable amount of vitamin D and calcium to meet the needs of growth, and failure to timely and reasonable supplementation. Premature birth, multiple births and low birth weight babies are at high risk for rickets. In addition, cold winter sunlight is short, ultraviolet light is weak, and children’s outdoor activities are significantly reduced, so that the amount of vitamin D produced by the body itself is reduced, which is also a risk factor for the occurrence of rickets. Recommendations for prevention of vitamin D deficiency rickets in China: Full-term infants: 400 IU/d starting 2 weeks after birth to 2 weeks of age Preterm infants, low birth weight infants, twins: 800 IU/d starting 2 weeks after birth and 400 IU/d after 3 months of age. It is recommended that the average daily outdoor activity should be more than one hour with more skin exposure.