Happy Heiny's hemp Stuffins are uniquely designed to fit Happy Heinys Pocket Diapers and Happy Hempy fitted diapers. They feature a pocket design that allows you to add extra absorbency where your baby needs it without increasing the bulk of your pocket diaper. For boys, place the oval all the way to the front of the Stuffin. For girls, place the oval in the center. Will the insert slip if only placed in half way? No - the small oval insert will stay in place. When used with the small oval insert (included) you will have 7 layers of hemp fleece in the desired wet zone for your child. You can use as many ovals as you need in the pocket for added protection in the wet zone without increasing bulk through out the diaper. Stuffins may shrink 1/2-1 inch after full priming. The more you wash these Stuffins, the better they get!!