Just a cute little idea I had about Sarah Jane have a baby that doesn't age to a preteen in one day.

Fandom: Sarah Jane Adventures

AU. Sarah Jane is younger when she meets Luke. She's only thirty-seven, and Luke isn't thirteen, he's nine. Sky comes along three years later. She's a baby, but then ages up to five instead of twelve. Sarah Jane is now forty-two years old. (Luke: 14 years old, Sky: 7 years old.)

Sarah Jane had gone to the hospital for a check-up. A nurse took some blood for testing and when a doctor came in the room a few hours later, there was a newborn baby girl in the arms of Dr. Richard Sand.

Sarah Jane stared at him, "Who's baby is that?"

"This is your daughter, Miss Smith." Richard informed

"But that's…" Sarah Jane started, but then the baby girl was placed in her arms and there was no doubt in her mind that this baby was hers.

That feeling wasn't like an adoptive mother. It wasn't like with Luke or Sky. Sarah Jane really did believe that she was the baby's biological mother. That was a result of the perception filter. You see, the baby girl is a Tenza.

"Oh she's beautiful." Sarah Jane cooed

"Does she have a name?" Richard asked the new mother

Sarah Jane nodded, "Lottie. Lottie Beatrix Smith."

A few hours later, Sarah Jane was dismissed from the hospital. She was packing up getting ready to go when her phone rang. The caller ID said that it was Luke calling. He and Sky were at Rani's house.

"Hey Luke, is everything alright?" Sarah Jane questioned

"Mummy, I miss you. When are you coming home?" It was Sky's voice.

Sarah Jane mumbled to herself, "Sky." Then she spoke, "I'm leaving right now. I'm on my way home, sweetheart. I love you."

"I love you too, Mummy." Sky responded before hanging up the phone.

Sarah Jane picked up the infant carseat and headed outside to her car. She buckled the carseat into the backseat, then got into the driver seat, and headed home.

-Ten years later-

Sarah Jane was out of town working on research for her latest story. Ten year old Lottie was home with her brother and sister.

"Lottie! Hurry up. You'll miss the bus." Luke yelled up the stairs.

"I'm coming!" Lottie called as she was running downstairs.

Luke handed his youngest sister her lunch, "You really need to stop taking so long getting ready for school. It's not a fashion show."

"Do I have to go to school? Can't I stay home with you and Sky?" Lottie wondered, "You're going to be having fun fighting aliens without me."

"Yes, Lots-Bee. You have to go to school. Mum will be pissed if I let you skip." Luke explained

Lottie shrugged, "Well Mummy doesn't have to know. Who's going to tell her?"

"The school will." Luke replied as he heard the bus outside, "And that's the bus. Now go on. Get out of here."

Lottie hugged her brother, "Bye Lukey. Love you."

"Love you too, Lots." Luke said as he hugged her back

I hope you enjoy. Comments are greatly appreciated.

What would you like to see happen next?