Baby 1.5 years old walking O-shaped legs may be physiological, may also be pathologic, the specific treatment measures should be combined with the baby’s situation to decide. 1. Physiological O-leg: most babies start walking O-leg is a normal phenomenon, because the baby in the learning to walk stage legs can not be fully stressed, standing will appear O-leg, usually with the baby’s age and normal activities slowly improve. If the parents do not have a history of O-shaped legs, there is no need to worry too much, pay attention to observation, defined hospital follow-up. 2. Pathological O-shaped legs: If the deformity is obvious when the baby walks, and even affects the activities, it is recommended to go to the hospital in time for examination and correction, and can choose to correct the deformity with the help of orthotics, and if necessary, surgery is needed. Diet attention to nutritional balance, follow the doctor’s advice to supplement calcium and vitamin D and so on. The baby is 1.5 years old walking O-shaped legs, it is recommended to go to the hospital in time, under the guidance of the doctor for examination and treatment, to avoid aggravation of the condition, affecting the development of the baby.