The human body has 206 bones, which are divided into three parts: skull, trunk and four limbs. Among them, there were 29 cranial bones, 51 pieces of trunk bone and 126 pieces of four limbs.

The bones of a child should actually be 217-218, with 305 bones in the first baby, because the children's sacrum is 5 pieces, and when they grow up they become 1. Children's coccyx has four to five pieces, and when they grow up, they also make one. The child has two iliac bones, two ischial bones and two pubic bones, and the adult is merged into two hip bones. This adds up to 11 to 12 more bones than adults.