A Blooper Nanny (initially known as Bloober With Kids) is a Blooper with Baby Bloopers found in Super Mario Bros. 3. When she begins to glow, her kids will "explode" away from her making it harder to swim. More kids appear a few seconds later.
Blooper Nannies later appear in New Super Mario Bros., where they only apeared in large numbers in a bonus room.
Blooper Nannies made occasional appearances on The Adventures of Super Mario Bros. 3, where they served as aquatic nuisances to Mario and Luigi.
Only one appeared in the Sunken Ship Super Mario RPG: Legend of the Seven Stars, and touching it or any of its babies would result in a normal battle with at least one Blooper.