Five months can not sit in the baby chair, five months baby temporarily can not sit alone. The baby’s motor development is formed with the myelination of the spinal cord, the spine in six months before the formation of the second physiological curvature, thoracic curvature formation before you can go to the training of sitting alone, five months the baby in accordance with the normal law of motor growth and development is not able to sit alone, do not go to sit on the baby chair for the time being. In the baby in five months to train its sitting alone, may lead to excessive pressure on the spine and affect the normal growth and development of the spine, the baby six months when the hands can be propped forward to sit alone, eight months when you can sit steadily, and so on eight months to sit independently of the baby chair is more appropriate. After six months the baby should not be too long each time to sit and stand, sit and stand for too long, not only did not train the baby to sit and stabilize the baby’s spine will have a negative impact.