Baby Luigi is the infant form of Luigi, similar to Baby Mario. His two costumes are him in diapers and baby clothes. However, he appeared in Mario Kart: Double Dash!! alongside his older self. It is generally accepted that this game does not have a story line and merely offers extra playable characters for greater variety. Baby Luigi first appeared in Super Mario World 2: Yoshi's Island where he was kidnapped by Kamek, then rescued by Baby Mario and Yoshi-wiki