Thanks to Karin for this Frugal Baby Tip!

I'll have a go at describing the origami fold. You do need a square to
begin with, so you're alright!
First fold up the diaper into four layers by folding in half twice,
once to make a rectangle, and then again to make another, smaller, square.

I'm left handed so if you're not just reverse these next bits!! I
never know if I'm doing things left-handed or right-handed!

Put all four corners of the diaper to the upper left hand corner
(you're working on a flat surface). You now have one thick fold down
the right hand side, and two slightly thinner folds across the bottom.
Pick up the top corner. Keeping the second corner in its place, take
the top corner across to the right as far as you can. The top part
should now look as long as your rectangle that you made at first, and
now you will have what looks like a triangle, with its center line
along the right hand side of a square underneath.
_______________
.....\ ......./
......\....../
.......\..../
........\../
.........\/

I hope this comes through alright!

Carefully flip the whole thing over, left to right or right to left
(not flipping it upside down). Then you have the triangle on bottom,
and the square on top, to one side. The triangle is the basic shape of
your diaper, and you will fold the square to make a central pad. Fold
the square, starting with the edge away from the triangle. Just fold
over and over, adjusting your folding so you will end up with a center
pad. You can fold it wider or narrower, as you desire.

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