Use the diaper

From Create Your Own Story

You go downstairs and ask your mom if she can get it off so you can use the bathroom. "it's a diaper, it is a toilet, just yours." You go back up to your room, and think "I don't want to seem like a baby, But I really need to go. You try to go but you can't. You sit on the toilet lid for a few seconds trying to think how to do it. And then it hits you. You can trick your body! All this excitement makes you pee, and you sign with relief.