I would to meet someone that has computer auto cad and can take proportional measurements of our current favorite baby diapers (pampers, huggies, luvs) even some of the old plastic style like pampers, anyway take those true measurement and then use the computer to make them larger (new measurements, but still the same diaper template) use those new measurements and either make new die cuts on a diaper machine or retool a whole machine, whoever can do this would make a killing.
So everything would be proportional, if a current baby diaper is 16" long by 5" wide then a new one might be 24" long by 8" wide, if the tape tabs are 1" wide then the new ones might be 2" wide, you get the point, but more importantly the copy would include the elastic leak guards and stuff to the will still pull and fit the same way.