Generally around eight months will crawl. Newborns prone position when there has been a reflexive creeping action; 2 months of age when prone to alternate kicking, is the beginning of creeping; 3 ~ 4 months of age infants can be used to hand-supported upper body for several minutes. 7 months of age when infants prone, can back or turn in place; 8 months of age when you can creep and crawl. 9 months of age infants have been able to crawl on their hands and knees, and can stretch out the side of the hand forward to pick up the object; 10 months of age after the children are skilled in crawling. However, due to the existence of individual differences, if the baby is slightly behind generally can be more training under the guidance of the doctor. But if significantly behind their peers, it is recommended to go to the hospital children’s health department in a timely manner, under the guidance of the doctor to identify the cause of the disease, and to be early intervention and training.