Baby Mario is the infant form of Mario and a supporting protagonist in the Mario video game series, most prominently appearing as the deuteragonist of the Yoshi's Island series. He first appeared in Super Mario World 2: Yoshi's Island for the SNES in 1995. He also appears in Mario Golf for the N64 in 1999, and Mario Tennis in 2000. He’s also one of the main protagonists in Mario & Luigi Partners in Time. Baby Mario also appears in the Mario Kart series such as Mario Kart: Double Dash!! and Mario Kart Wii. He appeared in Mario Superstar Baseball and Mario Super Sluggers. Four years later, Baby Mario appears in Mario Tennis Open for the Nintendo 3DS, this time as an unlockable character.