4-year-old child chicken chest is vitamin D deficiency rickets, need to take a large dose of vitamin D drugs, you can take Kachir Vitamin D2 Phosphorus Gluconate Calcium Tablets, you can also take Longmu Strong Bone Pellets and cod liver oil together with the treatment, because the chicken chest is a skeletal deformity, taking medication can only control the condition does not continue to develop, treatment 1-3 months after the medical examination of the bone alkaline phosphatase back to normal, the skeletal deformity is controlled to After 1-3 months of treatment, the bone alkaline phosphatase will be normalized, and the skeletal deformity will be controlled to the period of sequelae, and the chest will be corrected slowly.