Place it right after the stumble in your edit, then follow it with a baby laughing clip to turn the fall into a joke, or a goofy ahh sound when the trip looks deliberately staged.
About this sound
This is a short Peppa Pig clip built around Peppa tripping on a wire, paired with Bacon Strips, and it runs for just over five seconds. The cartoon stumble gives it a silly, light-hearted feeling that turns a clumsy fall into a quick joke, the kind of harmless mishap that makes people smile rather than wince.