Small femoral head of one year old baby may be caused by incomplete development, vitamin D or calcium deficiency, etc. Targeted treatment should be carried out according to different causes, and the treatment can be generally categorized into general treatment and medication. 1. Incomplete development: Generally formed during the embryonic period, it is easy to affect the development of bones, resulting in small femoral head. At present, it is necessary to make some adjustments in diet, ensure balanced nutrition, and develop good eating habits every day to promote the normal growth and development of bones. 2. Vitamin D or calcium deficiency: Vitamin D or calcium deficiency will affect the normal development of bones, including the femoral head. Vitamin D or calcium supplements should be taken as prescribed by the doctor to promote bone development. In addition, there may also be congenital malformations and other causes of small femoral head. Regarding the small size of the femoral head of one year old babies, it is recommended to clarify the cause before targeting treatment. Medications should be used under the guidance of a doctor.