Hey, guys! I had this idea swimming around my mind for a few weeks now and it wouldn't go until I wrote it down. Basically, it was just me thinking what would happen should any of the team's inventions get out of hand and how would they handle it.

Disclaimer: I do not own Big Hero 6 or the characters mentioned. They belong to Disney respectively but I would kill to have a Tadashi figurine.

Summary: Hiro's time reversal ray gun gets out of hand, turning half of the team back into children, including himself as a baby. Tadashi, Honey and Fred are the ones left to solve the problem, battling projectile vomit, late nights, bed wetting, dirty diapers and baby jokes while trying to turn their friends back to normal.

The lab felt crowded with the presence of the whole team there, including Tadashi. Afternoon sunlight filtered in, lighting up the space and highlighting the tiny dust motes swirling in the air, like lazy feathers twirling in a nonexistent breeze.

Hiro was busy tinkering with his latest creation, something that Tadashi knew had to do with time reversal. His younger brother had an inkling that he would be able to invent a machine that would shift the space time continuum by creating a rift in the fabric and reverting the bodies particles so that they would fit to inhibit the time that was pre-set. In short, Hiro thought he was on his way to a ground-breaking invention.

The mechanics of it all interested him, but a time reversal was a long eluded allusion of an invention in the tech community, something akin to the Loch Ness monster or a yeti – always talked about but never to be seen in the light of day.

So, it was with great amusement that he observed Hiro try to get the calibrations of the time ray perfectly, something that had been frustrating his brother for the better part of the morning.

"Did my measurements work?" GoGo asked, voice tinged with impatience as she watched Hiro. The petite
Asian girl was staring intently, willing to see if her ideas had helped. She chewed her gum loudly, a sign that she was anxious. Tadashi gave her an easy grin, adjusting the brim of his cap.

"Patience, GoGo. He just started five minutes ago."

"Thought he was some sort of super genius," she snorted.

"Super genius - yes," Hiro said, never taking his eyes off the ray gun. "Mega genius - questionable."

Baymax, the inflatable nurse bot that Tadashi had invented a year ago was staring at his little brother with the same intent gaze that GoGo was fixing him, head tilted to the side and barely blinking. Tadashi knew that the robot loved to watch them work, even if he had always replied breezily that he preferred to be there in case of any emergencies.

Fred and Wasabi both were engrossed in the latest video game that Tadashi had bought for his brother, the sound muted as Hiro didn't want any distractions.

Honey was in the corner with her phone, avidly texting and didn't look up as she said, "Oh, give him some space, guys, he can't work if you're pressuring him-"

"Yes!" Hiro exclaimed, lifting the simple ray gun in triumph.

"You did it?" Tadashi asked, genuinely surprised.

Hiro tested the gun by aiming it at the wall, fixing the settings and pulling the trigger. He watched a sharp green ray of light bounce off the wall, not leaving a dent. The temporary light show was over before it even started, leaving the young inventor scratching his head.

"What the flipping hot wings was that?"

Tadashi stood up and took the gun from his younger brother's hands. "Hmm, let's see." His observations made quick work of the different compositions of the gun before noticing that in his excitement, Hiro had forgotten to tighten the screw near the time calibrator.

"Here-" He took a screwdriver and did it for him, handing back the ray gun.

Hiro tested it in his hands and adjusted the knob for the time settings, pointing it at the wall again. He pulled the trigger and this time, the green ray rocketed off the wall, causing a ruckus of fallen equipment in the process.

Tadashi ducked from a beam that nearly collided into his head, diving down to the ground to avoid it. He could hear Honey shriek and the collective gasps from Fred and Wasabi.

"No-"

"What the-!"

"Hiro!"

The scuffle seemed to have settled, the air filled with the remnants of dust from the ceiling that the rays had disturbed. Tadashi glanced up, the lab in a wreck with strewn papers and overturned machines. Only Baymax was left in the centre, blinking slowly as if he did not understand what had just happened.

"Hiro?" Tadashi called out, heart thumping unevenly in his chest. "Guys?"

Nobody answered him and he started to panic.

He stood up and pushed himself out from the mess of Hiro's files. A sniffling sound stole his attention and he quickly ran to the source.

The young man pushed past the mess, eyebrows shooting high up in surprise when he noticed the bundle of clothes quivering. It was his brother's hoodie and red shirt. He pushed the clothes away, stunned to find a baby in the heart of the mess.

Upon closer inspection, he noted that it was Hiro, the same brown eyes staring at him up in fear.

"Hiro?" He stated in disbelief. "What-"

Another cry caught his attention and he bundled his brother up in his hoodie and walked towards it.

This time, it was a white shirt with a cropped leather jacket. Tadashi dreaded the thought of what was underneath those clothes, as strange as that might have sound.

He pulled the jacket up and saw a small child, fists bundled together looking on the verge of crying.

"What h-happened?" a miniature version of Leiko asked, small body trembling under her too big clothes.

"GoGo!" he said in obvious relief. "Don't worry, you'll be fine-"

"Tadashi, that you?" He had never been so relieved in all his life to hear Fred's voice.

"Fred!" he exclaimed, picking GoGo up and shifting her into his other arm. "Where are you?"

The couch flipped up and Fred came into view, still his normal self but looking considerably spooked.

"Whoa, what's with the kids?"

"You tell me," Tadashi countered, handing a child GoGo over to Fred. The little girl shifted and didn't want to get into the other boy's arms, her chubby cheeks frowning but a soothing touch on her shoulder from Fred changed her mind and she let herself be placed in his arms.

The comic nerd's face broke out in a grin. "Aww, GoGo really was adorable when she was younger." The child started crying in response and Fred's grin turned into one of horror. "What... no, no, no... how do I stop it from crying?"

Tadashi was about to combust from the ludicrosity of this situation and he didn't need Fred freaking out right now to add to the list of problems.

Hiro started whimpering in his arms and Tadashi shushed him, whispering, "Don't worry, we'll fix this."

"Guys, is everyone okay?"

"We're here, Honey!" Fred called out, GoGo squirming in his arms and managing to twist herself and ending up upside down.

"Fred!" Tadashi barked. "That's not how you hold a kid!"

The other male looked towards his friend, noted Tadashi's hand positions and copied him, re-positioning the kid.

"Better?"

"Yes."

"Guys, what the heck just happened... whose kids are those?" the blonde girl said in obvious confusion as she gaped at Tadashi and Fred.

"Brace yourself, but... they're Hiro and GoGo."

Honey's eyes widened as she took in the situation. "Hiro's ray gun!" she exclaimed, face breaking out into a horrified expression. "It turned them into-"

A loud cry interrupted her and she turned to the couch where the sound was coming from.

She didn't stop to assess the situation, diving towards the couch and pulling up the cushions to find a green shirt and trousers with a shaking bundle underneath.

"Oh, no, Wasabi..."

She picked the crying child up and rocked it gently. Wasabi had a fist in his mouth, tears streaming down his face and Honey tried to sooth him by patting his considerably tinier dreadlocks gently. "Guys, what in the name of holy hydrogen is going on?"

Tadashi noted that only Hiro, GoGo and Wasabi were affected by the ray gun and that meant the three of them were left as the only adults in this situation. This wasn't good. Not. At. All.

"Baymax," he said in a groan.

The robot that had remained silent throughout the whole exchange looked up at the mention of his name. "Yes, Tadashi?"

"Scan all the young children to see if they're okay."

Baymax did as he was told, head moving to scan them. He started with Hiro, then GoGo and later Wasabi.

"Well?" Tadashi asked impatiently.

"My senses indicate that the young are well and healthy, with the adrenal cortisol rates at a higher level than normal but their heart beats are significantly calming down. Diagnosis: Healthy but a little shocked." The robot blinked. "It is to my suggestion that you continue rocking them to calm their nerves."

The three of them did as they were told, each one shifting the kids a little uncertainly in their arms.

"Man, I've always wanted a younger sibling," Fred said wistfully while GoGo held a fistful of his shaggy blonde hair in her tight grip.

"Me too," Honey replied with a small smile.

Tadashi could only stare at them in disbelief, Hiro squirming once again in his arms. He looked down at his brother and saw how he truly had been changed back into a baby; chubby cheeks, fluffy hair and pink toothless gums appearing once again.

"Guys, what are we going to do?"

Fred glanced at Honey who just shrugged. The tall blonde hesitated, eyes darting from Tadashi to Hiro behind her pink-rimmed glasses. "Do you think you can reverse the effects of Hiro's ray gun?"

Tadashi thought this over for a moment. "I could," he clarified, "but I'm going to need my brother's blueprints, codes and algorithm equations for this." All three of them stared at the messy lab, and Fred sighed.

"Guess we would have to start looking?"

Honey made a face, lifting Wasabi up. "Oh, no."

"What?" Tadashi asked in apprehension.

"I think he just let one go... in his own clothes."

Wasabi could only giggle, repeating, "Go! Go!" in his child-like voice. Tadashi would never believe he would live to see the day where his burly and tough friend would be reduced to laughing at the fact that he had pooped in his own pants.

"Eww," Fred said and Tadashi flinched.

"Do you have any extra diapers here?" Honey asked, nervously gnawing her bottom lip as she held the child at arms length.

"Yeah, 'cause we keep some in case Hiro wets his bed," Tadashi replied sarcastically.

Honey rolled her eyes and would've thrown up her hands in frustration if she weren't holding her friend. "Maybe you should go and buy some kiddie stuff."

Tadashi opened his mouth to argue but snapped it shut. Honey had a point.

"Can you watch over the others while Fred and I head into the nearest supermarket?"

Honey nodded, holding her free arm out and gently cradled Hiro to her side. "Hmm, you were right, Tadashi," she said in amusement. "Hiro really is a hairy baby."

The baby in her arms gurgled and Honey couldn't help the wide smile that graced her face. She was a sucker for anything small and adorable; Hiro just happened to be both.

"Okay, we'll be back in a few minutes." Fred handed GoGo over to Baymax whose robotic limbs stretched with an audible hiss to hold the child.

Baymax tilted his head as he regarded the child in his arms. "What a fiesty little infant," he regarded in that clipped monotone. And it was true. Among all the other children, GoGo was the most active, kicking and pushing, trying to fight her way out of the robot's arms.

"No! Don't want big, funny white robot!"

Tadashi cracked a smile. He couldn't wait to tease the girl about her personality when she became a full fledged adult once more. Hopefully he wouldn't have to wait for another twenty more years for that day.

Fred and him ascended up the stairs into the cafe with him looking around surreptitiously for Aunt Cass. His aunt seemed to be nowhere and Tadashi nearly smacked his head when he remembered that his aunt was on an excursion out of town to another restaurant for an opening ceremony and wouldn't be back in another two days.

The clicking sound of high heels could be heard coming up the stairs before Honey peeked up at them, grinning sheepishly."Psst, Freddie, could you get me a strawberry canned float from the supermarket, please? Kinda getting thirsty."

The comic book nerd gave her a serene smile and nodded, ignoring Tadashi's glare of impatience.

Honey stuck her tongue out at Tadashi. "Lighten up, mister. You're going kiddie shopping!"

"The joy," he deadpanned although his expression changed. "By the way, who's carrying the kids?"

Her mouth fell open comically and she disappeared down the stairs, squealing, "Baymax!"

Tadashi sighed, shaking his head. "May the Force save us all."

*Re-edited to correct some grammatical mistakes.

A/N: Did you guys enjoy this? Please take a moment to let me know what you think about this!