What episode of Happy Planet is Happy in a tutu?

What episode are you asking about? It's in the second episode of Happy Planet Part One.

The second episode of Happy Planet tells the story of Lele's mother, who is so eager to see her son grow up that in order to make Lele grow up to be more capable of surviving, she is always designing Lele's future according to her own desires and painstakingly. First, she lets Lele learn ballet, and then she lets Lele learn piano. The depressed Lele can't convince her mom and doesn't know what to do.