A/N: Disclaimer: I disclaim everything except the child Doctor. Coz I don't think the BBC have any rights on him :D

One of those Doctor-becomes-a-kid fics which there are so many of nowadays, I just wanted to do my take on it :D

Canon is my deluded fantasy of Ten, Jack and Rose in the TARDIS, mid-series 2, post-Age Of Steel.

UPDATE 14/02/2015: Have now fixed all the Gallifreyan to conform to my Dictionary!

Chapter 1 – A Strange Day

"The Geron, it put the Kuku down… down on the table, and then the Doctor, he… he looked at it and then… And then…!" Rose gasped through her laughter, trying in vain to tell a story of one of her adventures to her mother but simply laughing too much to be able to speak. Jack was laughing with her, looking as though he were almost about to cry as he doubled over, clutching his stomach.

Rose tried in vain to compose herself, finally managing to stop herself laughing – but then she took one look at the Doctor sitting on the sofa next to her and burst out laughing again, tears streaming down her face.

Jackie somehow knew she wouldn't be able to get the punchline from Rose within ten minutes so she turned to the Doctor. "What did you say?"

"I didn't order this," the Doctor muttered. The result from Jack and Rose was an explosion of laughter that almost blew out the windows.

"I can't breathe!" Jack gasped, still doubled over and laughing.

As Rose and Jack continued to laugh their ways into an early death, Jackie continued to stare at the Doctor. Normally he would be bouncing around like a five-year-old child who'd had too many e-numbers, but right now he was hunched over on the sofa, closed off to the world, hands clutched to his head in a posture quite unlike she'd ever seen him before.

"Are you okay, Doctor?" she asked quietly under Rose and Jack's uncontrollable laughter.

He just nodded. Jackie instantly knew that something was wrong.

"Cup of tea?" she offered. He nodded again, not even looking up. She got up and left the two laughing lunatics behind to go to the kitchen.

When she returned they had managed to calm down enough to speak again. She set the four teas down on the coffee table with a packet of biscuits, which Rose quickly took possession over. Jackie looked back at the Doctor. He still hadn't moved.

"Doctor?" she asked. Finally Jack and Rose seemed to notice that something was wrong and looked over to their friend, just in time to see him suddenly collapse down off of the sofa onto all fours, coughing, choking and gasping for air, but he wasn't laughing. Rose got to her feet, alarmed as he suddenly started to retch, and then finally he lurched and threw up over the carpet.

"Doctor!" Rose panicked, moving over to him and wrapping her arms around his chest in an attempt to support him. He continued to retch, throwing up all over the carpet again before he finally gasped and flopped down onto his back, narrowly avoid his own puddle of sick.

"He's thrown up over my carpet!" Jackie realised as the Doctor continued to gasp of air, his eyes tightly closed to the world above him.

"Mum!" Rose protested, trying to hold the Doctor in comfort as best she could. "Help him!"

Then the Doctor fell completely limp and silent on the floor, looking as though he'd passed out. But the nightmare was only just beginning as seconds later he began to fit violently on the floor…

"Jack!" Rose shrieked, unsure of what to do. Jack quickly grabbed her and pulled her off of him, holding her back.

"Let him do it," he said simply, but his calm demeanour was only a front for the panic he was feeling inside. What the hell was going on?

It felt like hours before the Doctor finally stopped, and opened his eyes dizzily. Jack let go of Rose as she quickly dropped down next to him, stroking back his hair and rubbing his shoulder in a futile attempt to reassure him.

"Doctor," Jack said quickly, dropping down next to him. "Can you hear me?"

The Doctor stared at him as though he'd forgotten who Jack was. After a moment he blinked and opened his mouth, but only a weak, half-audible voice came out:

"Coming," he whispered.

"Coming?" Jack asked. "What does that mean? Doctor?" But he'd already passed out.

Jackie was already taking action. "Can you take 'im to that TARD-whatsit?"

Rose shook her head. "She's in lockdown, self repairing…"

"Take 'im to the spare room, then," Jackie said, pointing in the general direction. "The pyjamas are in the airin' cupboard."

Jack nodded, putting his arms beneath the Doctor and lifting his limp body into the air. "Spare room over here?" he asked, inclining with his head. Rose nodded, quickly moving in front of him to show him the way as Jackie went to retrieve some carpet cleaner.

Jack and Rose barely talked as they redressed the Doctor and settled him into the bed. He showed no signs of stirring. When they were done Rose stared at the Doctor lying in the bed, oblivious to the world around him. This was Christmas all over again. Same room, same unconscious Doctor, and even the same pyjamas. This couldn't be real. She was in a nightmare.

"What's wrong with him?" she asked Jack quietly.

Jack didn't have an answer for her.

Day turned into night, and the Doctor didn't even move.

The atmosphere in the flat had drastically reversed from hysterical laughter to uncontrollable worry and fear in one fell swoop, and they still didn't know what was going on.

Rose kept imagining the worst possible scenarios: a sickness, a delayed after-effect of the regeneration, a breakdown into death…

Between her and Jack they had tried to think of something he'd had recently that could have caused this, but they had come up with nothing. He'd been eating and drinking as usual; he'd been perfectly fine until they'd got to the estate.

"He still hasn't moved," Jackie said as she closed the spare room door behind her, walking back over to the other two. "I put a blanket over the duvet, he was shaking."

Rose continued to stare at the floor. "Why has this happened?" she finally asked in a whisper.

No one answered.

"I think we all need to go to bed," Jack suggested, glancing around at the two women in the room. "He'll probably be fine in the morning."

Rose nodded, wiping her eyes of unfallen tears. "Probably," she said, and in a strange way, she believed it too.

Tap. Tap. Tap. Tap.

Something was outside the front door of the Tyler flat.

Wanting to be let in.

Tap. Tap. Tap. Tap.

Jack awoke clumsily from a deep sleep. He opened his eyes slowly to meet the living room ceiling, wondering what could have awoken him.

Tap. Tap. Tap. Tap.

Was someone at the door? What time was it?

Tap. Tap. Tap. Tap.

Well one thing was for certain – they weren't about to go away. Moaning, he dragged himself to his feet dressed in only a pair of blue boxer shorts and tried to remember where the light switch was.

Tap. Tap. Tap. Tap.

He flicked on the light, and almost stumbled in surprise as the shocking bright light invaded his sleepy eyes. Blinking a few times to adjust he stumbled over to the front door, and pulled it open.

He peered out into the blackness.

No one was there.

He shivered as the breeze of the cold wind outside washed through him and he quickly shut the door again. Probably just starting to rain, he reasoned, and very willingly flicked off the light and felt his way back to his bed made up on the sofa.

He was already asleep when the door of the spare room clicked quietly closed.

It was a lovely sunny morning when Jackie awoke. Jack was still snoring loudly on the sofa when she passed through to make breakfast. She made tea and piled some breakfast onto a plate, and headed to the spare room where the Doctor was.

She opened the door as quietly as she could and stepped in. She could see the Doctor's wild brown hair sticking out from under the covers. Well that was good, wasn't it? At least he'd moved during the night.

She moved over to the bed, setting the tray down on the bedside table.

"Doctor?" she called. "Doctor?" No response.

She frowned. Something was wrong, here. She lifted a hand to grasp the covers, and pulled them back to reveal the person beneath.

And then she screamed.

Stumbling backwards she smacked into the wall, hands over her mouth in pure shock and horror. She could only watch as the person in the bed awoke with a jolt, deep brown eyes staring at her in an equal amount of shock before he bolted upright, and began to scream with her.

"Rose!" Jackie yelled, still staring at the person screaming at her.

"Mum, what the hell?" came Rose's sleepy voice as she came into the spare room, still in her nightie with her hair absolutely everywhere.

Jackie raised her hand, and pointed at the person in the bed. Rose looked.

"Oh my God," she whispered, shocked.

"Rose? What's going…" Jack trailed off pathetically as he saw what they were all looking at, somehow having lost the ability to talk. He let out an undignified manly squeak,

In the bed was a small, brown-haired brown-eyed boy, staring at them all with wide, terrified eyes.

"What the…" Jack whispered.

"Who is that?" Jackie asked in a whisper.

Rose swallowed. "I think… he's the Doctor."

There was a small, silent pause before Jackie spoke.

"He's smaller than I remember," she said.

A/N: Hey? What's this? Is this a "next time"? I haven't done this since Ramble 4! :D

Chapter 2 – Hello, John!

"Why don't you go back to bed?" Jackie suggested.

"But I awake!" he protested, suddenly launching off of the chair and jumping up and down, the pyjama shirt that had previously fitted his lean, adult form now hanging loosely on him, big enough to be his tent. Halfway through jumping his foot caught on the inside of the shirt and he fell to the floor lightly, giggling. The others watched in bemusement.

"We really need to get 'im some clothes," Jackie said, gazing at the boy as he got to his feet and started running around in circles, still giggling to himself.

"And a name," Jack said. "We can't keep calling him Doctor, 'cause, well, that's not the Doctor anymore."

The boy suddenly stopped, looking at him quizzically. "Doctor? That's a stoopid name," he said.

"Well what is your name?" Jack asked, and then held his breath. Rose held her breath, too. Even Jackie held her breath. The Doctor's real name was…