A newborn baby’s thumb has no metacarpal support and is suspended, which is not only unsightly, but also loses all the functions of the thumb. This is a rare case of floating thumb, also known as hovering thumb. The cause of floating thumb is not yet clear, so moms don’t have to blame themselves too much for it. Floating bunions are scary to look at, but they are now treatable. There are three main treatments for floating bunions: index bunion, hemi-metatarsal reconstruction and hemi-metacarpal graft reconstruction. Demonstration thumbing involves taking the floating thumb off and moving the demonstrator finger to the position of the thumb so that it functions as a thumb. After the surgery, the child will be left with four fingers on the hand. This method is used more often by foreign doctors, but it is less accepted in China, and parents have a hard time accepting the reality that their child has only four fingers. Hemi-metatarsal reconstruction is to take part of the metatarsal bone from the foot to reconstruct the first metacarpal bone, this method will cause permanent damage to the child’s foot, the child can not go down for three months after the operation, only lying or sitting, which is very difficult for children in their active age, and there is also a certain chance of bone resorption and necrosis, so I recommend hemi-metacarpal bone graft reconstruction. The hemi-metacarpal bone graft is taken from the child’s second metacarpal bone to reconstruct the first metacarpal bone, and the entire surgery is performed on the child’s hand only, without touching the other parts. It is relatively easier to care for than metatarsal reconstruction, and the chance of bone resorption and necrosis is much lower. It does not affect the growth and development of the second metacarpal bone and avoids some of the effects of thumbing and metatarsal reconstruction.