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Blooper Babies, also stylized as Bloober babies, are infant Bloopers. In most of their appearances they are often seen alongside Blooper Nannies, a species of female Bloopers who release multiple Blooper Babies when they glow, afterwards Blooper Babies will follow their mother and help her pursue Mario.
Super Mario series
Super Mario Bros. 3
They first appear in Super Mario Bros. 3, where they are released by glowing Blooper Nannies, and swim in a straight line after released.
New Super Mario Bros.
New Super Mario Bros. Wii
Blooper Babies and Blooper Nanny reappear in New Super Mario Bros. Wii where they behave in the same way as in New Super Mario Bros.. In this appearance they appear to lack pupils. They can only be found in World 4-4.
New Super Mario Bros. 2
New Super Mario Bros. U
Blooper Babies, as well as Blooper Nannies, appear in New Super Mario Bros. U, being featured prominently in the level Blooper's Secret Lair. They behave the same as in past games. As Blooper Nannies don't appear in New Super Luigi U, Blooper Babies are absent as well.
The Adventures of Super Mario Bros. 3
Blooper Babies made a few rare appearances on The Adventures of Super Mario Bros. 3, where they appeared alongside Blooper Nannies. In Oh, Brother!, Blooper Babies are seen following a Blooper Nanny in Pipe Land, just like in the game. In Recycled Koopa, A Koopa Zombie releases Blooper Babies from a ketchup bottle, after squeezing it.
Nintendo Adventure Books
Super Mario RPG: Legend of the Seven Stars
They appear again alongside Blooper Nanny in Super Mario RPG: Legend of the Seven Stars. Touching one of them starts a battle with a normal Blooper.
Super Mario Maker / Super Mario Maker for Nintendo 3DS
Paper Mario profile and statistics