20 is the official age from "Baby" to "Adulthood".

It was early morning in Arendelle. Their newest Queen was walking through the hallway, her ice dress dragging behind her along the floor.

She entered into the royal dining room. The room was mostly devoid of people, a maid correcting crooked paintings on the wall and another servant bringing small plates covered in breakfast. Sitting to Elsa's right stood a high chair, empty of any occupants.

Elsa turned around towards the palace guards standing guard by the doorway.

"Where is Anna?"

The two guards gave each other a look, expecting the other to say something.

"I'm here."

Elsa heard someone running, steps thumping along the carpet before her sister ran in.

"Sorry. I almost overslept."

Elsa's sister Princess Anna has her hair in her casual pigtails. She is dressed in a very frilly deep-blue dress, her forearms exposed as the dress puffed out in the shoulders. Beneath her skirt, she wore a white set of puffy bloomers over a proportionally sized diaper.

"It's alright Anna. Now come here. Its time for breakfast."

In their part of the world, there was no "adolescent", "preteen" or "teenager". If you were 20 or younger, you were legally a "baby". By 21, you were officially considered an "adult". "Babies" from straight out of the womb up until 20 years of age were fed from high chairs, played with toys and wore diapers. Because of this, many of the local traditions dictate how some of the people may live. While Elsa's grandfather removed the "mandatory by law" conditions behind these traditions, many of the families in Arendelle still follow some of these traditions by habit. Maybe you helped your family with chores or helped in their livelihoods depending on the family, but most often, you wore diapers or some other babyish customs prevail.

They made their way to their seats. Elsa undid the front of the high chair for Anna and helped her onto the seat before she locked the little table in place.

"What would you like?"

"Bacon and toast and porridge please."

Elsa filled her sister's plate with her food, she placed the plate and bowl onto Anna's tray. Next to them she placed a wooden sippy cup full of milk next to them for Anna to drink out of. Elsa scooped up a spoonful of porridge

"Come on Elsa, I can feed myself," said Anna, laughing at her sister's actions.

"I know Anna, but I want to feed you. That's what big sisters do."

Elsa was 21, having been potty trained before her parents vanished at sea and now crowned queen, but Anna was 18. Anna has not been potty trained yet, so Elsa still had some time before Anna was legally an adult.

Just thinking of Anna, still just a baby chasing after her through the hostile terrain when her powers froze the kingdom, frightened her. Without her momma, Elsa knew she needed her big sister to look after her.