Function:

1. Enhance the inadequate head control

2. Improve the strength of lower limbs

3. Pull the leg muscles that may have been shortened

4. Keep different body parts aligned correctly

5. Make breathing smoother, because when standing upright, the lungs can expand better and inhale more air.

6. Promote blood circulation

7. Promote digestion, because food will flow down naturally

8. It can promote bone development and bear bone stimulation that can be enhanced

9. Promote interaction with the environment and peers to keep the line of sight at the same level