A little energy ball

This is me.
I like me.
Mummy says I look lovely. I hope you like me too.

This is me standing up and trying to eat the playpen. It's a bit harder than bread. And not quite as nice. But now I know what it tastes like.

This is me still standing up a few hours later. Are you ready to party?

Hum, apparently not. Daddy... daddy?

Ok. I'll just find something else to do, then. Oh, I still need to taste the grey cat.

Come to think of it, mummy did also mention something else. Can't remember well. Could the word "tiring" have been involved?