When Colgate takes her daughter to the Hayburger, Colgate thought everything would go fine. When they don't have the toy that Lyra needs though, she gets upset and does the unexpected to get her.
Daring Do was pushed her into a Fountain of Youth and was regressed into a foal. She then finds Ahuizotl (who was also regressed into a kitten). The two have to trek through the jungles of the Tenochtitlan Basin and find a way to turn back to adults
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.
(An indirect sequel to "Finding Shining" and "Finding Sunburst" by Foal Star.) Princess Cadence willingly turns herself into a foal to spend time with her daughter. But Cadence soon desires to have her own foalish adventure and slips away.
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.
(Story idea requested by superfun. Contains age regression, diapers, and diaper useage! Reader discretion is advised.) When Diamond Tiara and Silver Spoon lose a bet to the CMC, they are turned into foals for a week. The CMC must care for them.
(A collab with Latecomer, open to all authors. Stories should be SFW with some potential PG content, rated Teen to be safe.) A collection of stories involving various characters undergoing potty training, to varying results.
Pound and Pumpkin Cake's parents decide the twins are finally old enough to begin potty training. This is a collection of the various comedic escapades that the twins got up to as a result. Rated Teen as a precaution, but should be mostly G/PG.
Having embraced her inner foal for a number of months, Starlight's ageplayer side has been accepted by her mentor, childhood friend, and best friend. So what about what might be the source of these desires; her father?
(Rated Teen to be safe.) Cheerilee decides to turn herself into a foal, so her students will have hoofs on experience taking care of one. But are her students up to the task of caring for their foalified teacher?
Rainbow Dash wakes up in a bed of flowers in a cave as a filly with amnesia. Lost and confused, she's taken in by a goat monster named Toriel. That's okay though, as long as she has DETERMINATION she can get through this.
Hoity Toity is suddenly turned into a foal, and his collection of foal clothes went missing. Now he'll have to go to Manehatten and win a foal fashion show with the help of Rarity.