Many children have slightly bowed legs before the age of 2, which will straighten out later. Some children may appear to have a degree of in-toed walking. Typically, a child’s in-toed gait will disappear after the age of 7. No treatment is needed. A very small number of bow legs or in-toed gait are caused by diseases and require medical treatment. Recommendations: Rickets caused by vitamin D deficiency can lead to bow legs, so it is important to take vitamin D supplements preventively before the age of 3, with 400 IU daily.