Warts are generally harmless skin growths. They are very common, affecting about one in five children and infants. Warts can appear anywhere on the skin or mucous membranes (e.g. mouth, genitals). However, they are most commonly found on the hands, fingers, feet, and face. Warts can be spread to other people, usually through skin-to-skin contact. Scratching can spread warts to other areas of the child's skin. Warts can also be spread indirectly through public swimming pools or showers, especially if your child is barefoot and has a scratch or cut. It is recommended to wear slippers in public pools and showers. Warts are small, firm bumps on the skin caused by a virus in the human papillomavirus (HPV) family. In this article, we explain how babies and children get warts, how they can affect them, and how to diagnose and treat them.