Pinkie Pie yawned as she collapsed on the bed.
"G'morning Yawn! Flutters!" she exclaimed.
"Good morning Pinkie." Fluttershy said. "Don't'cha need to go to work at Sugarcube Corner?"
"I asked for an off day." Pinkie Pie yawned. "I want to spend it with my new wife!"

Fluttershy nodded, flying down the stairs. Pinkie Pie followed, collapsing on the sofa.
"This might seem random - okay, everything I say is random - but I wish I could get experience being a mother." Pinkie said.
"You already do. You've babysat the Cake Twins multiple times." Fluttershy said.
"Yes, but that's not enough to have enough experience to have a child!" Pinkie exclaimed. "... Is it? I wonder if we could foalsit the Crusaders..."

"Hm... Maybe... No..." Fluttershy murmured.
"What is it Flutters?" Pinkie asked.
"Well I was just thinking that maybe we could ask our friends... to... cast an age spell on themselves... so we can know what it's like to take care of foals..." Fluttershy murmured.
"That's a great idea!" Pinkie Pie exclaimed. "C'mon!"
Pinkie Pie bounced off, as Fluttershy sighed and followed.

"Come to mine and Fluttershy's Cottage in... hm... half-an-hour? No... Fourty-five minutes!" Pinkie Pie exclaimed to Twilight, hopping away.
She told all her friends that. Rainbow Dash, Applejack, Rarity...

Fluttershy made tea for her friends, and Pinkie Pie made cupcakes.
"Can foals eat cupcakes?" Pinkie asked.
"Maybe mush them a teensy weensy tiny bit?" Fluttershy suggested.
Pinkie Pie agreed, starting to crush them and then slowing down.

A few minutes later they heard a knock on the door.
"Anypony know why Fluttershy and Pinkie Pie needed all four of us?" Twilight asked.
"I do not. Maybe it's just a sleepover?" Rarity asked. "But I'm not dressed for a sleepover!"
"I know Fluttershy, she doesn't exactly like sleepovers. She has to sleep in the dark, and, sure, other ponies are there, but still!" Rainbow Dash exclaimed.
"AJ, darling, you've been quiet. Do you know anything?" Rarity asked the earth pony.
"Ah don't either. Sorry. How's everypony's been doing?" Applejack changed the subject.
"Good." all the ponies said, albeit in different ways.

Fluttershy opened the door, and said, "Hi everypony! Please, take a seat."
Pinkie Pie hopped over with the plate of sort of mushed cupcakes.
"Did you mess up the cupcake mix? If not, why are they... mushed?" Rainbow asked.
"Well... Fluttershy, could you please... er..." Pinkie awkwardly shifted her hoof.
"Pinkie, why are you the shy and nervous one right now? Gasp! Did you switch personalities!?" Rainbow Dash asked.
"No. We didn't. You see... Well..." Fluttershy gave a breath in.
"We want to prepare for being mothers so we thought we'd ask if you guys would be fine with casting an age spell - and foal mind spell - on yourselves! Is it okay?" Pinkie Pie asked.

Their friends just gave them blank stares.
Twilight was the first one to speak.
"For how long?" she asked.
"As long as you want I guess. I guess at least a week?" Pinkie said. "If you're okay with it, that is?"
The four ponies discussed it, before nodding.

"Twilight, you'll have to do it." Rarity said. "I can't."
"Okay." Twilight sighed. Fluttershy grabbed a book, flipping it to a page. "Here it is."
Twilight's horn glowed as she recited the spell. "Just replace "filly" with "foal"."

Give me the naivety of a foal,
the joy and obliviousness,
the thought that I can do anything.

"There's one other thing that's needed!" Pinkie exclaimed. She pushed another book in front of Twilight, flipping it to a certain page.
"Foal Mind Spell?" Twilight read. "Why?"
"And why isn't the age spell taking effect?" Rainbow Dash asked.
"Well when Starlight doesn't distract Twilight it takes a bit!" Pinkie Pie exclaimed. "And it's so we truly know what it's like being mothers!"
"Okay." Twilight sighed.

Give me the mind a foal,
the same thoughts of a foal,
please remove the pressures I have in my life

Twilight's horn glowed and surrounded her friends and her. Fluttershy and Pinkie Pie hid behind the sofa.
A few minutes later the light faded. Pinkie Pie was the first to peek around the sofa to see four foals.

"The spell worked Flutters!" Pinkie Pie exclaimed. The foals clamored over her. "Hi girls! Is everypony okay?"
"Mama!" the foals exclaimed.
"Wait... Mama?" Pinkie asked. "Fluttershy! Are you okay over there?"
"Yes, I am! But did they call you or me Mama?" Fluttershy asked.
"That's not the important thing! What is is the fact that somepony was called Mama!" Pinkie Pie exclaimed. "Great... Anyways... Um... Dashie, how'd you get your cutie mark?"
"I'm a foaw Mama! I was a mawe, but I don't wemembew that much fwom that wife!" Rainbow Dash exclaimed. "Except that I was fwiends wiff Twiwight and Wawity and Abbojack!"

"What about me and... er... Mama?" Fluttershy asked.
"Youw ouw pawents, duh!" she exclaimed. "Can I pway wiff my fwiends?"
"Well if we're all of your parents then how are they your friends and not your... er... sissies!" Fluttershy asked.
"I don't know! We just don't wike cawwing each othews Sissy or anythin wike dat! I'm goin to pway with dem." Rainbow Dash managed to fly away - just barely as her wings were small - leaving a veeeery confused Fluttershy and Pinkie Pie.
"What in Celestia?" Fluttershy and Pinkie Pie said in sync.
"Jinx! You owe me a soda!" Pinkie Pie exclaimed.

"This! Is! Serious Pinkie!" Fluttershy exclaimed. "Twilight? Rarity? Applejack?"
The three foals approached.
"Yeah Mommy?" Twilight asked.
"Is evewythin okay Mommy, dawin?" Rarity asked.
"Um... Applejack?" Fluttershy said.
"Yeah Ma? Everythin' okay?" Applejack asked.
Well at least one of them calls me something that isn't Mommy. Fluttershy thought. "N - Nothing sweeties. Go and play with Dashie."

The three foals ran to the pegasus.
"Well what in Celestia's fridging flank is going on?" Pinkie asked.
"I don't know... We don't even have the right supplies to take care of them! ... do we?" Fluttershy asked.
"Do you keep diapers from foalsitting the Cake Twins?" Pinkie Pie asked.
"I think so!" she said. "But I don't have cribs or toys or anything!"
"Guess we'll have to shop for supplies..." Pinkie sighed.

Author's Note

Yes that was the same spell from my fanfic My Little Filly.