Zu Yan playing with a soft ball with his leg at 4 months old.
My mother saw a similar soft ball while shopping with baby and me. She handmakes one for Zu Yan with her excellent quilting skills.
Zu Yan loves it very much. To manipulate a bit, I put some green beans in a small sauce container (KFC salads sauce container) and stuff inside the ball.
Now he has a ball that makes sound when he kicks or shakes it.