Whether it is multi-fingered or floating thumbs, their causes of malformations are probably related to these factors: 1, the mother’s physical health during pregnancy, have you been sick? Did she take any medication? All of these may increase the chances of the child having hand deformities, so it is important to try to ensure good health during pregnancy. 2.Environmental factors, the mother should try to avoid inhaling formaldehyde, second-hand smoke and other teratogenic substances during pregnancy. 3, genetic factors, there is no other hand deformity patients in the family? If so, the newborns in the family may also have hand deformities. Compared to other hand deformities, the chance of inheritance of bunions is very low. I have seen a lot of people with bunions, but I have not seen any children with bunions from parents who have bunions, so we need to find out more about whether bunions are hereditary. If the child only has a floating bunion, we will help the child to preserve the five fingers through hemimetacarpal bone graft reconstruction technique, which can take care of both appearance and function. After the surgery, the child can use the affected hand to do some pinching, twisting, and gripping, and can basically satisfy the needs of social life. If the baby has a polydactyly combined with a floating bunion, we need to set up the surgery carefully. In this case, the polydactyly can never be cut off or operated on separately. Why? Because the most obvious symptom of a floating bunion is the lack of metacarpal bone, or only the remains of the metacarpal bone. If the child has a polydactyly in the other hand, we can utilize this extra finger to reconstruct the first metacarpal bone during the surgery. Although this surgery is more complicated, it is in the best interest of the child.