Four Modes that Adapt with Growth.The first stage is to learn sitting posture, which can help children stabilize their sitting posture and exercise their grip; The second stage is to adjust the sitting posture and exercise the child's leg muscle tension by toddler chair; The third stage is to learn to walk mode, allowing children to walk naturally with their feet on the ground; The fourth stage walking mode, walking with the hand on the toddler chair, can exercis the coordination of the limbs.