This baby’s mother and father always felt that the thumb on the baby’s right hand was strange, but compared to the left thumb, where the problem could be seen at a glance, they thought it was fine and thought the baby would be fine when he grew up. The baby’s right thumb is dysplastic, there is no big fissure, the tiger’s mouth is small, the movement is not good, and the movements such as palming cannot be done. The left hand is a floating thumb, which is a more serious type of thumb hypoplasia with bad shape and no function. In the right hand, we need to open the tiger’s mouth wider and do the reconstruction of the opposite palm. For the left hand, we can do a hemipalmar bone graft reconstruction, which requires a two-stage surgery, the first stage gives the bone and the second stage gives the thumb function. When we help the baby to create good conditions, mom and dad should actively guide and exercise the baby. Because little babies do not have the sense to exercise on their own, and the functional exercise after surgery is very important, so mom and dad should let the baby exercise slowly, the better the exercise, the better the function and shape of the baby’s thumb, and there are many babies who have already proved this.