Babies don’t usually crawl at 4 months of age, but again, each baby’s growth and development varies. Most babies will crawl at 6 to 10 months of age, and each baby’s growth and development is different. However, 4-month-old babies will crawl too early, usually 4-month-old children will roll over, generally will not crawl, at this time the baby’s small muscles will be a bit deficient, should try to let the child do less of such actions, so as not to have an impact on the development. Crawling on the baby’s physical and intellectual development is very important, the baby’s learning ability is very strong, 4 months to learn to roll over, 6 months on the tendency to crawl, began dragging the belly rubbing creeping crawling, 9 months to be able to crawl on hands and feet, the amount of activity increased, parents are advised to help their babies to exercise the muscles of the limbs. Specific recommendations to consult a professional physician’s opinion.