I've noticed some errors in your thickness measurements. You said a stack of 3 diapers is 11.2 cm, and that a single diaper is 4.4 cm. 11.2 divided by 3 isn't 4.4, it's about 3.75. So, either your measurement for the stack of diapers is incorrect or your division was incorrect. I don't mean to be nitpicky, but .7 cm is a pretty big difference for the thickness of a diaper.