Prince Boo is the infant form of King Boo. There is not much difference between Prince Boo and his adult form except the he is smaller (making his crown look bigger). He always seem to carry his pacifier in his hand instead of in his mouth.

He also appears in Super Luigi World: The Time Shift. He is a boss character that appears in Baby Boo's Mansion. All his attacks but simply be avoided to make him get dizzy, but you must grab his dropped pacifier and throw it at him for him to get hurt. He is defeated after 5 hits, and you must battle him WHILE battling King Boo.

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Babies

Baby Mario | Baby Luigi | Baby Peach | Baby Daisy | Baby Wario | Baby Waluigi | Baby Donkey Kong | Baby Bowser | Baby Dry Bowser | Baby Bones | Baby Yoshi | Baby Funky | Baby Birdo | Baby Kamek Baby Rosalina | Baby Diddy Kong | Baby Dixie Kong | Baby Petey Piranha | Baby Geno | Prince Boo | Baby Toad | Baby Toadette | First-Mate Syrup | Baby Tiny Kong | Baby Koopa | Baby Blooper | Baby Boo | Baby Swanky Kong | Baby Candy Kong | Baby Crash | Baby Maria | Baby Luise | Baby Waria | Baby Walice | Baby Metal Mario | Baby Eyerok | Cheepy | Baby Sonic