Floating bunions are mostly caused by accidental factors, which may be related to the mother’s health condition during pregnancy or external environmental stimuli, such as formaldehyde. I have seen a lot of babies with floating bunions, but I have not come across any cases where the parents have floating bunions and the babies also have floating bunions. Therefore, we still need to further confirm whether floating bunions have some hereditary possibilities, but as far as we can see, floating bunions do not have much to do with heredity. The most notable feature of a bunion is the lack of a metacarpal bone or only the remains of a metacarpal bone. Because there is no bone to support the bunion, it appears to be floating, and there is no way to talk about its function. Therefore, the first step in treating a bunion is to rebuild the metacarpal bone in order to preserve the baby’s five fingers. There are two ways to rebuild the metacarpal bones of a floating bunion, metatarsal bone reconstruction and hallux valgus bone graft reconstruction. Metatarsal reconstruction involves removing a portion of the metatarsal bone from the foot to rebuild the first metacarpal bone, which has a certain risk of bone resorption and necrosis. Moreover, as the foot is a weight-bearing area for a long period of time, the removal of a portion of metatarsal bone will have some impact on the metacarpal bone, which is a concern for some parents. Metatarsal reconstruction surgery should not be performed at too young an age. Generally, babies who undergo this surgery are past the stage of establishing thumb function and have been forced to develop a habit of pinching, so that the post-surgical functional exercise will not be as smooth as when they were young. Hemimetacarpal bone grafting is a technique to reconstruct the first metacarpal bone from the second metacarpal bone of the affected hand, which is much less prone to bone resorption and necrosis than metatarsal bone. Moreover, the entire procedure is performed on the hand only, without touching other parts of the body. Moreover, the technique can be done when the baby is around 6 months to 1 year old, which is the stage when the baby’s thumb function is established, so his postoperative functional exercise will be relatively smooth, which is more favorable to the baby’s physical and mental development.