A, the normal development of crawling 1, September belly crawl 2, October uncoordinated four crawl slow movement 3, November available hands and knees interactive action, stable four crawl Second, the method of training crawl 1, four-point kneeling training: baby hands, knees support, parents hands on the baby’s hips, slow vertical pressure, while you can move the baby’s center of gravity forward and back, lateral force. 2, four crawl training: baby hands, both knees support, parents in the back of the baby, with hands to assist the baby’s side of the hand forward, followed by hands to assist the baby’s opposite side of the lower limbs forward, continue to assist the baby’s other side of the hand forward, lower limbs forward, repeatedly alternate. (For example: left hand → right foot → right hand → left foot) Note: When four crawl, the baby is required to support the body with both hands.