Baby vertebrae protrusion may be a normal physiological phenomenon, but we can not rule out due to trauma, congenital spinal deformity, thoracic posterior mediastinal space-occupying lesions and other diseases caused by abnormal phenomena. 1. Normal physiological phenomenon: if the baby’s age is within six months, when the development of the body is not stable, there may be a hunchback, resulting in the protrusion of the vertebrae, which is a normal physiological phenomenon. When the baby in seven months later, the strength of the back muscles gradually develop well, generally this phenomenon will be relieved. 2. Trauma: the baby’s bones are relatively soft, if there is a traumatic injury, may damage the bones, affecting the normal structure of the baby’s bones, which is more likely to lead to the baby’s protruding vertebrae. 3. Congenital spinal deformity: if the baby has congenital spinal deformity, such as kyphosis or scoliosis, it may lead to some changes in the skeletal condition of the spine, thus making the baby’s vertebrae protrude. 4. Thoracic and mediastinal space-occupying lesions: if the baby’s body has soft tissue tumors around the spine or vertebral bone tumors, and so on, if the tumor tissues continue to grow, it may lead to the baby’s symptoms of herniated vertebrae. If the situation of herniated vertebrae is more serious, it is recommended to go to the hospital as soon as possible for relevant treatment.