Many people say that “left-handed” people are smarter, but some children are forced to become “left-handed”. For children with a floating right thumb, if they do not become “left-handed,” they will not be able to eat, write, or draw in the correct position, so they will have to make full use of their left hand. Because the right thumb has been in a non-functional state for a long time, many children with floating thumbs will habitually use their left hand or use their right index and middle fingers to pinch, although the function and shape of the thumb has been greatly improved after hemimelia reconstruction surgery. Therefore, as a parent, you must let your child use the right hand more often after surgery, so that your child can learn to use the right thumb to palm, to hold large objects, and to pinch small things. These movements are perfectly possible for the child, as we have many cases that have proven that the child’s thumb functions better and better as long as the parent and child work well together. Similarly, for children with a floating thumb on the left hand, active functional exercises are required after surgery. This is because only by moving and exercising the thumb sufficiently will the function of the thumb improve significantly. This is something that parents must take seriously.