If you want you could come along to our coffee group in Helensville on Wednesday morning, I'd be happy to take along a few med and large nappies of different types for you to try. JJ's approx 10kg and only just fitting large ittis, he still fits his mediums. (We've had the large ittis for a while now but until now the wings have drooped something chronic.)
PM me if you want to know details for the coffee group