Caillou (1998)

Season 1: Episode 55

Caillou thinks his sister Rosie is getting favorable treatment and it just isn’t fair! Mom explains to him that Rosie is just a baby and can’t do a lot of the things she asks him to do. Caillou decides being a baby is better than being four and pretends to be a baby—until Mom tells both her babies it’s time for a nap. Maybe being four is better than being a baby after all!