Baby Luigi (Earth-1344)

"Uh-oh, Baby Luigi time!"

- Baby Luigi

Baby Luigi is the infant form of Luigi. In the Yoshi's Island series, he is kidnapped several times by Kamek, where Yoshi, who is protecting Baby Mario, is required to rescue him. Besides the Yoshi series, he has appeared as a playable character alongside his older self in various spin-off titles such as the Mario Kart series and Super Team Racing.

Source

 * https://www.mariowiki.com/Baby_Luigi