Peter was able to walk a whole cirle while holding onto the edge of his play-yard! I discovered it and was so excited and asked Lei and Yaya to take a look. Yaya didn't seem to understand why it is worth so much of our joy and excitement, and she ran over and jumped into the play-yard right away. "Mommy, why Peter walked so slowly?" She ran in a few seconds several rounds of the play-yard, "See? I can walk much faster and i can do it for ever.." ... Well, i don't know how to respond.