The human body stabilizes at 206 bones in adulthood, and the number of bones is greater in infancy because the sacrum and coccyx are not fused. In infancy, the number of bones is greater than 206 because in infancy, the coccyx and sacrum are not fused into one bone; the sacrum has five bones and the coccyx has four to five. And in adulthood, the coccyx and sacrum are fused into one bone each, so the number of bones in the human body is fixed at 206, which is divided into three major parts: the skull, the trunk bones and the limb bones. The cranium consists of 29 bones, which are divided into three parts: the cranial bones of the brain, the facial bones of the skull and the auditory ossicles. The trunk bones consisted of a total of 51 pieces, which were the cervical, thoracic, lumbar, sacral, caudal, sternal, and rib bones. There are a total of 126 limb bones, which are divided into upper and lower limb bones. Each bone in the human body is different in shape, size and function, and is connected by joints or soft tissues such as fibers and ligaments to form a whole. The number of bones in the human body after adulthood is fixed at 206, have their own different functions, if the body of the bone discomfort symptoms, need to go to the hospital as soon as possible, improve the relevant examination, clear diagnosis and follow the doctor’s instructions for treatment, so as not to delay the condition.