Eight months to one year old: At this time, the baby can play with the very low slides in the room. But at this time, the baby can not control his body balance, in the process of sliding, parents have to protect children along the slide. 1-2 years old: Under the protection of parents, babies can play on straight slides with smaller gradients, so that babies can understand the rules of the topic. 2-3 years old: Try to let your baby slide on a small slide. During the process, the baby can be guided to control the speed of sliding by holding hands and loosening both sides of the slide, feeling balance and body friction. 3-4 years old: Can let the baby try large slides and rotations. Consciously exercise the baby's physical coordination. In a safe and unattended situation, try to let your baby crawl down the slide and exercise the coordination of the strength of his limbs, hands and feet on a smooth slope.