So, there have been many super-strong kids in fiction. Molly Hayes in Runaways, basically every kid in Dragon Ball, Hell, freakin' Bamm-Bamm from The Flintstones.
However, all of those kids lacked something. None of them LOOKED like they could throw around cars. I'm here to rectify the situation
Let me present you Bonnie. This little powerhouse from Ireland is barely five years old, but she already has the strength of fifty men. How? Nobody knows. She's good, she's playful and she just loooves showing off her strength.
EDIT: It appears I hit del on the wrong layer and saved. Goodbye sharp shadows
It's the shape of her face. It's the shape of a 18-25 year old. A five year old, even one with massive muscles, would still have a more round face, more round eyes and nose. More like a child.