This child has a special case, one side has polydactyly and the other side has a floating bunion. Before he came to us, he had already seen several doctors, and the advice given by several hospitals was to remove the floating bunion and do bunionization. However, the child’s family did not want to remove the thumb and wanted to keep the floating thumb. We thought it would be a pity to remove the floating bunion, so we gave him a treatment plan of transplanting the bones of multiple fingers onto the floating bunion. The parents were very happy with this option because it would correct the polydactyly and would not require the bone to be taken from another part of the child’s body to save the bunion. The surgery was done according to the preoperative design. After the surgery, we found that the child’s metacarpal bone grew well after transplantation, survived well, and healed well. According to our plan, the child was given a second stage of functional reconstruction. What impressed me a lot about this child was that he was doing very well with the functional exercises. Although the grandmother has been taking care of him, she is very concerned about the post-surgical functional exercises and has been following our steps very closely to help the child. From grasping large objects to pinching small objects. Several times we found that the child’s functional exercises showed very good linear growth, and he could unscrew bottle caps, hold pens and write, including grasping grains of rice with precision. Also, because of the ideal functional recovery, the child’s entire thumb size grew well, and the length of the grafted metacarpal bone recovered ideally. Therefore, for children with floating bunions and other hand and foot deformities, as long as parents give them enough attention and guide them to do enough functional exercises, the final recovery results will definitely be very good.