Children with O-shaped legs are commonly found in two situations: First, the corresponding stage of growth and development will appear in the legs are not straight, the phenomenon of O-shaped legs. Second, due to pathological reasons, common in rickets, calcium deficiency or bone malnutrition and other diseases. In the child just standing, walking, that is, at about 1 year old children’s legs are not very straight, especially just standing, walking, gait is not very stable, with the child’s growth and development and lower limb function gradually improve, legs will gradually become straight. Disease-related O-shaped leg deformity is also accompanied by other bone changes, including occipital baldness, square skull, and even deformity and deformation of the bones of the upper limbs. You should not judge whether your child has the disease simply by whether the legs are straight or not. You can go to the hospital and see a doctor for a detailed examination to determine whether the cause is physiological or pathological.