Polydactyly is one of the most common deformities in children (some children have a family genetic tendency), which is the growth of one or more fingers (toes) on a child’s hand or foot, the most common number is 6 fingers (toes); the common site is the radial side of the thumb, followed by the ulnar side of the little finger; common shapes are fleshy (i.e. polydactyly as a mass of soft tissue), bifurcation, crab claw, and concatenation. Radiographs can help to understand the growth and development of the bones and joints of polydactyly (toe) and its deformity. In most cases, they are connected to the bone joints of normal fingers, so polydactyly not only affects the aesthetic appearance, but also hinders the function of the hand, and can seriously affect the development of the normal fingers (toes) connected to the polydactyly, resulting in deformation of the fingers (toes) of the hand and foot. Therefore, polydactyly needs to be treated with plastic surgery. So, at what age and when can polydactyly be operated? It depends on the type of polydactyly. In the case of the fleshy type, once the diagnosis is clear and the child is healthy, surgery can be done at any age and time; in the case of the split and crab claw type, surgery should be done after 6 months of age; and in the case of the juxtaposed type, surgery is best done after 1 year of age; in addition, for other types of polydactyly that require simultaneous bone and joint repair, surgery is best done after 1 year of age. Parents of children with polydactyly should be reminded that the hands and feet are functional parts of the body that are essential for children to live, learn and work when they grow up, and also affect their appearance. Therefore, the treatment of polydactyly should be done with great care and must be done in a hospital with a plastic surgery specialist and a physician experienced in pediatric plastic surgery to ensure your medical safety and quality of care.