The bones in the human body are divided into two main parts: the axial skeleton and the appendicular skeleton. The axial skeleton is made up of the bones that line up along the central core of the body. Babies are born with around 270 bones, which grow together and fuse into the adult skeleton. The number of bones a person has can vary, depending on differences in their skeleton, such as: Having a different number of ribs, Having fewer vertebrae, and Having fewer digits (fingers or toes). Bones are the body’s main form of structural support.