Baby Luigi

Baby Luigi is the infant form of Luigi. In the Yoshi series, Baby Luigi was kidnapped twice by Baby Bowser and Kamek. In these games, Baby Mario, along with Yoshi, have rescued Baby Luigi a few times.

Super Mario World 2: Yoshi's Island
Baby Luigi appears with his twin during the events of Super Mario World 2: Yoshi's Island when he and the Stork carrying him are captured and held by the evil Magikoopa, Kamek. After going through the many levels and bosses, Baby Mario and Yoshi rescue Baby Luigi. The Stork then successfully delivers the young Mario Bros. to their parents.

Yoshi's Island DS
Bowser and Kamek kidnaps, Baby Luigi, who is one of the kidnapped babies in Yoshi's Island DS. After Baby Mario, Baby Peach, Baby Wario, Baby DK, and Baby Bowser team up, they all went to save Baby Luigi. It turns out that Bowser is kidnapping all of the babies because he is searching for the seven Star Children. Fortunately, Baby Luigi hides at the time Bowser is checking the babies for stars. After defeating Bowser, Baby Luigi is rescued, and the babies find out they are Star Children. Later, it is revealed Baby Yoshi is the last child.