One year old baby leg shape like a looping leg, may be a physiological situation, may also be caused by calcium deficiency, should promptly consult a doctor to clarify the cause of the disease after treatment. 1. Physiological situation: the influence of gravity, its own physiological curvature and other factors can cause a one-year-old baby legs like legs, is a normal phenomenon, generally no special treatment, observation. 2. Calcium deficiency: young children’s growth and development is relatively rapid, easy to occur calcium and vitamin D deficiency, such young children are more likely to appear legs, delayed development of teeth, not easy to sleep and other symptoms. One year old baby legs like legs, there may be other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, to give targeted treatment or treatment.