A/N: This is my Ninth Rugrats/All Grown Up Fanfiction and this could be that quite interesting as they could go that this is my 5th Age changing story as I get to make it as they could know that after Grown Up Babies, Baby Stu And Stu, All Grown Down, Flushing Waters Of Youth and 34 going on 3, this one is about Grandpa Lou gets to be exactly gets turn into a baby so it could be that quite interesting as they get to make it as they could make it as Grandpa Lou gets to be enjoying his youth again as he wanted to be getting of what he used to be, and that's where were our story begin.

Chapter 1:Stu Invent RugratX

One fine morning, Stu was working on an formula that makes people want to be young again as they want to make sure that quite he could be reversing the aging process as he could feel like it as he was going to make it though the distance.

"Yes, I done it," he said to himself. "My greatest formula available, the brand new RugratX as anyone that could be that quite simply as they could feel like it!"

As he gets to use it, he knew that he was going to enjoy that he was going to make it as he was going to feel that he was going to enjoy as he was going to let anything as they could know about it.

As his dad Lou came in to babysit the kids. "Say Stu, what you got there?" Lou asked. "This is my brand new formula known as RugratX, it can turn anyone into an early age so they could feel like it as they could get to enjoy their youth as possible."

"You know, I'm not the one who got to know this but I think that we should that it isn't safe for anyone." said Lou. "What you created is a tough a formula that could turn people into infants."

"Ah, you worry too much Pop, besides, what could go wrong as they could think?" as he gets to test it on that plant, he knew that he was going to make sure that he was going to make it as they could follow as they might get as they had to wait as they plant gets to be shaking as it got reduced into a sapling. "Yes, it worked!" as Stu said.

"You know, I Think that could be that worked very well." said Lou.

"With this, I bet it could hit labs all over the world so they could make this as they could feel young again."

"Yeah, I hope that you're right son." as they get to feel that they're going to make it a dangerous potion.

Just then, they had to go see the formula closer. "Do you think that your grandpa and your grandma had to make it more reasonable for some people about it?" asked Kimmi. "I don't know, maybe." said Tommy. "Maybe if we could get it, they may need to make it as they could feel like others."

"Yeah, I think that they had to go back to diapers so they get to enjoy being babies again." replied Phil. "Gee, I think that it could be that quite simply had to know that quite notice about it." said Lil.

It seems that quite as they could notice that it was going to hope that quite that it was going to feel like it but isn't that worth it?

Find out what happens in the next chapter and see if Lou and Lulu can take care of the babies while the RugratX could be safe or dangerous.

In the meantime, please make comments in the comments in the comment box and have a nice day.

Thank you.