Image imported from derpibooru
Original Description:

One day, the Equestria Girls wake up in a baby nursery and find themselves wearing only diapers. They were a bit embarrassed, then suddenly a tv screen lowered from the ceiling displaying swirling hypnosis spirals. All their eyes turn into the same spirals; they were being hypnotized. The swirling screen displayed words that convince the dazed and diapered Girls that are not adults, they are babies. Then the voice said when she counts to 3 and says “Wake up, my little babies”, the Girls with start beginning their new lives as babies, then asked the Girls “Do you understand?” The entranced Girls all reply in unison “Yes, mistwess, we undahstand”. Then the voice said calmingly: “1… 2… 3… Wake up, my little babies”. And the Girls woke up and the screen went back into the ceiling. The Girls were no longer themselves; they actually think they are happy little newborn babies. They now even only speak baby talk. The Girls then go all around the nursery and play like real infants. Their minds were now only set on games, and toys, and laughs, and fun.