Star children

The Star Children are seven babies that possess, as Kamek put it in Yoshi's Island DS, "an extraordinary amount of power." In the game, Bowser travels back in time to steal the stars from these children to take over the world ("the world will be your oyster") – the true intentions behind the kidnappings of all the children. However, none of the children captured by the Magikoopas were star children, because they were...
 * Baby Mario
 * Baby Luigi
 * Baby Peach
 * Baby DK
 * Baby Wario
 * Baby Bowser
 * Baby Yoshi

It is likely that Baby Yoshi, who is green, is the Yoshi. He is shown being hatched at the end of the credits of the game. However, it is unclear whether Bowser was already in possession of one of these stars from his baby self, or whether the star moved on to another baby or disappeared when he grew up.