On a beautiful sunny afternoon, the Sevilles were doing the things they love doing on Saturdays. Alvin was playing with his guitar in his shared room, Simon was doing experiments in the basement, and Theodore was writing notes as he watched the cooking channel.

Dave had to work and he wasn't home yet. Miss Miller was suppose to keep an eye on the boys but, the boys convinced Dave to not tell Miss Miller. They felt like they were old enough to be alone for most of the day.

Meanwhile at the Millers

The Chipettes were getting ready to go to the Seville house. They go to the house every Saturday to spend time with the boys. Miss Miller, wasn't gonna go with them because, she had a dentist appointment.

Before the girls could leave, Miss Miller tells them "Girls I'll be back in a few hours. Try to not get in trouble while you're at David's place. I don't want to ground any of you" Miss Miller looked at Brittany as she said this.

Brittany knew that Miss Miller was only saying this for her. She rolls her eyes and says "Miss Miller. It's Alvin who starts the arguments. I'm always nice to him-"

"Liar, you're a trouble maker just like him Britt"

Eleanor cut her off. Brittany looked at her and was about to yell but, Miss Miller doesn't let this happen

"Ah ah ah, you see Brittany. You're about to start an argument. Please be nice okay. Anyway I gotta go. See you later girls"

said Miss Miller who gets in her car and drives away.

The girls, except Brittany who was still mad, wave at Miss Miller. They then make their way to the Seville house.

Meanwhile back with the Sevilles

Alvin wasn't playing with his guitar anymore so he leaves his shared room. He walks by the living room and sees Theodore who was drooling while watching a commercial about a cake.

Alvin curls his lip before chuckling. He was about to go in to the kitchen but then stops walking. "Hmm, I wonder what Simon is doing" he heads to the basement instead.

As Alvin got closer, he hears the sounds of liquids being mixed and the voice of Simon who was talking to himself.

Alvin slowly approaches his brother and was gonna scare him but then, he changes his mind when he notices a pink bottle a few feet away from Simon.

"Cool, I wonder what it is. Maybe it's an energy drink. Yeah i think it is" he thought before approaching it. Alvin grabs the bottle and puts it in his pocket before exiting the basement.

As he made his way to his room, he hears the door being opened.

"Hey girls, how are you?"

"We're good Teddy. What about you?"

Alvin realizes that the Chipettes have arrived. He sighs and says "Oh great. Another day with miss Drama queen" he goes into his shared room and closes the door.

He puts the pink bottle on his bed before saying "This will taste even better if I add some soda" he then leaves the room.

Meanwhile downstairs

"Jeanette, Simon's in the basement and Brittany, Alvin's in our room" the two girls thank him before they go to where their counterpart are

Brittany who approaches the boys shared room says "I wonder what Alvin is up to. Hmm, he's probably planning to give headaches to his brothers like every day. Typical Alvin"

Brittany then notices that the door to the boys room was open. She knocks before saying "Alvin, are you in here? Can I come in?"

She doesn't hear him reply but still goes in. "Alvin where... Hello what's this thing?" Brittany spots a pink bottle on top of Alvin's bed. She approaches it and says "Since when does Alvin like pink? Wait a minute. I think it's a energy drink. Perhaps strawberry?"

She then opens the bottle and sniffs the inside. She gags and says "Eww, it smells like a sweaty sock. Does Alvin really like drinking this?"

Brittany sighs and was gonna put the lid back on the bottle but then, she decides to taste it. "Alright maybe it won't taste as bad as it smells" she then begins to drink the bottle which tasted good but, unbeknownst to her the bottle wasn't an energy drink. It was something that only old people can drink.

Meanwhile with Alvin who was in the kitchen. He found a can of soda so he heads back to the room. "I hope Si doesn't notice that his drink is missing. I know it's stealing but... Ugh I want to know what it tastes like. I'll put it back where I found it in a minute" thought Alvin.

When he arrives back at the room, he notices that the pink bottle was on the floor and the liquid had spilled on the floor.

"Oh no, what happened to..." He then notices some pink clothes next to the bottle.

"What the"

Alvin gets closer to the clothes and notices that there was something under them.

Alvin swallows nervously as he realized that these clothes belong to someone he knows.

He picks up the clothes and his jaw drops. He was lost for words. No words could describe the look he had on his face. On the floor there was something tiny. There was a baby girl who was naked as she was laying on the floor. She was sleeping while sucking her thumb.

"HAAAAAAAAAAA"

Alvin screamed as he took steps back. He recognized the baby. He knew who she was. Alvin glances at the pink bottle and realizes that it wasn't a energy drink. "Oh no, no, no, no, no. I'm so dead. I'll be grounded for years. Brittany must've drank the bottle"

Suddenly the others head in to the room.

"Alvin what happened?"

"You almost gave us a heart attack"

"Yeah, you sounded like a maniac"

"Why did you scream like that?"

Suddenly the others hear the voice of a baby crying. They look at the floor to see a baby girl they've never seen before.

Simon who gasps, sees the bottle that he created on the floor. He picks it up before angrily breathing hard. "Alvin, did you gave her my youth potion?" asked Simon while looking very unhappy.

Alvin smiles nervously and says "Well, no, yes, maybe. I..." Simon rubs his temples before saying "You idiot look what you've done"

While Simon started to scream and lecture his brother, the others were still shocked. They kept looking at the baby girl, who had awakened because of Alvin who screamed.

Eleanor shakes her head and approaches the baby. She gently picks her up and looks in to her eyes. Baby blue, Brittany's eyes were baby blue.

Jeanette approaches her and touches the baby's head.

They both give Alvin a murderous look and ask "Seville, what did you do to our sister?"

Alvin nervously looks at them and says "Well... I went to the basement and found what I thought was a energy drink and I brought it here. Then I went to the kitchen to get a soda. Brittany must've came to the room and drank that bottle" he points at the bottle Simon was holding.

Simon sighs and says "Alvin, because of you, Brittany's now a baby. You shouldn't have went to the basement and grab things that don't belong to you-"

"Hey if it's anyone's fault that Brittany has become a baby, it's yours. You're the one who created the bottle-"

"You weren't suppose to touch it. I left a note saying DO NOT TOUCH. I even put your name on the note because I know you always go in to the lab to touch things that you aren't suppose to touch"

Said Simon who regretted not locking the door. His and Alvin's nose were touching as they glare at each other.

"It's not my fault she-"

"Alvin enough. We don't blame Simon. We blame you" Jeanette interrupted Alvin.

The others agree with her. Simon throws the bottle at the floor before saying "Alvin, this youth bottle is for middle aged people only. I made it for Dave. This drink makes you younger"

For the first time in his life, Alvin was feeling guilt. He was regretting that he took something from Simon. Alvin looks at him and says "Can you create a potion that can change her back to normal?"

Before replying, Simon looks at baby Brittany who stopped crying and sees her giggling while she was being tickled by Eleanor.

Simon smiles warmly at Brittany before glaring at his brother. "I can make a potion that has the opposite effect but, it will take me at least a week to make it. Meanwhile you're gonna have to take care of Brittany-"

"Hey that's not fair-"

"Alvin don't start complaining. It's your fault. You shouldn't have touch things that aren't yours. Brittany is your responsibility. She depends on you now. Now if you'll excuse me, I need to start creating the potion that will change her back to teenage Brittany"

Simon leaves the room and Jeanette follows him.

Theodore takes out a scarf from his closet and says "Put this on her. She could get sick if she doesn't wear something that can keep her warm" Eleanor thanks him and wraps the scarf around Brittany's tiny body.

Eleanor approaches Alvin and says "You better hope Miss Miller or Dave don't find out about this" she then hands Brittany to Alvin.

"Theo and I are gonna head to the store to buy baby clothes and other supplies. We'll help you get the supplies but you'll be the one who takes care of Brittany. Don't take your eyes off her Alvin"

with that said Eleanor grabs Theodore's hand and heads to the doorway.

As Theodore made his way out, he looks at Alvin and smiles sympathetically. "Good luck"

Alvin was now alone with Brittany who was staring at him. He looks at her and says "Well, it's just you and me now Britt. Let's hope Simon finishes creating that potion soon"

Brittany who kept staring at him, smiles and playfully begins to clap her small hands

Alvin smiles as well and says "Hmm, maybe this won't be difficult to do.. i think"

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