Star children

The Star Children (singular: Star Child) are seven babies that possess, as Kamek puts 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 universe – the true intentions behind the kidnappings of all the children. However, few of the children captured by the Toadies turned out to be star children.

History
Baby Mario, Baby Luigi, Baby Peach, Baby DK, Baby Wario, and Baby Bowser were all captured, but Baby Mario and Baby Peach were rescued by The Stork from the initial kidnapping, Baby Luigi hid at the time Bowser was checking the babies for stars, Baby Wario was dumped in a cave by a Toady after he threw an enormous tantrum, and Baby Bowser enraged Bowser into kicking him out of the castle. It is unknown how exactly Baby DK escaped capture, only shown falling from the sky and landing on Yoshi's back. It is unclear, however, whether the seventh Star Child was born prior to the game's events, or if it was born at the very end of the game.

Star Children

 * Baby Mario
 * Baby Luigi
 * Baby Peach
 * Baby Donkey Kong
 * Baby Wario
 * Baby Bowser
 * Baby Yoshi

Trivia

 * It is likely that the green Baby Yoshi is the actual Yoshi seen in many games. He is shown being hatched at the end of the credits of the game. If Yoshi was first discovered in Super Mario World, capable of knowing speech at the time of Mario being an adult, then this seventh star child is Mario's best friend, Yoshi.
 * 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. Bowser may have also been simply oblivious to the fact that he himself was once a Star Child.