This child belongs to polydactyly and can be completely corrected by surgery. Polydactyly is a common deformity, which often coexists with short fingers and syndactyly, especially in thumb and little finger. The etiology is not clear, and it is often related to genetic abnormalities. Deformity plastic surgery should be between 6 months and 2 years old after birth, which is the best age for hand plastic surgery. The reason why we choose to operate before the age of 2 is mainly conducive to the improvement of children's hand function. Moreover, when we were young, the appearance of the whole hand will be more beautiful when we grow up, especially the syndactyly and polydactyly, which will also give children a healthy and normal psychology and personality. If they are sensible and find that their hands are deformed, it will inevitably cause trauma to their young hearts. Therefore, we must operate as soon as possible. However, for individual cases, such as radioulnar dysplasia, which involves the development of bones, it is advocated that it should be carried out in adolescence, that is, between12 and15 years old.

A few people still need to observe the function of their hands for a long time before they can accurately retain the positive finger and remove the secondary finger. It is recommended to go to a larger regular hospital for pediatric surgery or plastic surgery or orthopedics.