Soz about the rushed post yesterday, (work). As I was saying, I find the 3xl size pants to be best fit for mine, they come with a 43cm / 17inch crotch which is plenty big enought for most. When you start getting into cloth nappies and booster pads the crotch gets very bulky, and after a while you'll probly get into double diapering which these wide crotch pants can easily handle. I use 1.5 meter terry sqaures (4.9 ft) so you can imagine the bulk of one folded up running through the middle. Hope this helps,