Dysplastic floating thumb, which affects both function and aesthetics, requires surgery to improve the floating thumb. Many parents know little about floating thumb, worrying that their children are too young to have the surgery, and worrying that it is inconvenient for their children to go to school when they are older, so how old can a child be for floating thumb reconstruction and remodeling surgery? In the past, we would recommend that the child undergo the surgery at around one and a half years of age. With the development and advancement of medical technology, we are now using Semi Metacarpal Bone Graft Reconstruction (SMRT Floating Finger Reconstruction), which is the most advanced surgical procedure, whereby a portion of the bone from the child’s second metacarpal is taken to rebuild the first metacarpal bone, and the surgery is performed only in the child’s hand and will not affect other parts of the child’s body. By improving the child’s floating finger, this technique not only successfully preserves the five fingers, but also successfully advances the age at which the child can undergo the surgery to between 6 months and 1 year, which means that the child can establish thumb function earlier. So parents don’t have to worry, if the child’s weight meets the anesthesia requirement, there is no other heart disease, and the child is in good health, the child can undergo the floating finger reconstruction surgery between the age of 6 months and 1 year old, and if the child misses this age, the child can undergo the surgery, but it’s better to have the surgery before the child goes to school.