First, start with naked baby in need of a diaper.

I like to fold the back part under and lay her on top. That "lip" of diaper keeps the poo-splosions from going up the back.

The I roll each side in like so...

And so

Take the rolled parts up between the legs

And then fan them out to each side

Grab the corners of diaper from behind

And fasten!

Cover, and you're done!