Rainbow Dash and some of the other recruits from the Wonderbolt Academy were regressed into toddlers. Now they have to relearn how to fly to escape the Daycare and find Twilight.

Rainbow Dash has been given the role to give birth to the newest reincarnation of the Goddess of Fire

Big Mac decides to transform into a mare to be in the Sisterhooves Social for Apple Bloom

Dr.Whooves's time machine malfunctions causing him to regress into a foal and now has to go on a journey through time and space to turn back to normal.

Trixie was regressed into a foal after her age spell was redirected at her

Granny Smith has been turned into a much younger more sexier mare and decides to embrace her new body.

After making a bet with Discord, Princess Celestia must keep her new chaotic powers in check for one week. Seems simple enough

This is an anthology of the mane six having odd dreams about being treated as foals

Rainbow Dash has been possessed by a mysterious dress that is making her act more like a fashion model. Rainbow Dash always dresses in style

Twilight, Celestia and Luna are transformed into Ursa Minors and have to find a way to return back to normal

A "what if?" scenario if Rarity got inspire by foalish outfits in the episode Inspiration Manifestation

Shining Armor was transformed into a alicorn princess by a strange book and now he has to attend classes to either go back as a stallion, or remain a alicorn princess.

Celestia was regressed into a school filly by Discord and endures constant patronizing

Twilight goes back in time as a foal to save herself from Starlight Glimmer

A anthology of stories about many ponies and their experinces in a nursery run by robotic nannies.