under.......maybe thats where im going wrong?
Confusing isn't it
Rise is almost always measured over the nappy... (always as far as I know but I'm sure there's exceptions)
Don't forget by the time you've added bulk to a nappy (i.e. inserts to a pocket etc) you need more fabric to go around them if that makes sense?
Try measuring his rise without a nappy and then measuring one of his nappies (stretched) and then measuring over said nappy... See what the difference is...