A 1-year-old baby with bent legs may be a rotund leg, or it may be due to other reasons, such as premature walking, calcium deficiency, etc. 1. As babies learn to walk at around 1 year old, mild leg bending is considered to be due to the characteristics of growth and development. Babies can maintain body balance through their own adjustments when they first learn to walk, and if they stand up too early, it may lead to leg bending. 2. However, if the baby due to vitamin D deficiency, etc., may suffer from rickets and secondary rickets, thus causing leg bending. Calcium deficiency may also lead to poor development of the bones in the legs, resulting in abnormalities in the legs. In this case, it is recommended to take the baby to the hospital for examination and treatment as soon as possible after a clear diagnosis. Normally, you can give your baby vitamin D supplements under the guidance of the doctor, and your baby needs to get sunshine frequently, which is conducive to calcium absorption and improvement of symptoms.