Charlotte still fitted into her larges and OS nappies comfortably when she pt'd at 2 years. I definately agree with the others that they go through quite a chunky stage and then slim down - with Charlotte we didn't change the poppers on any of her nappies for about a year - she seemed to stay the same size around the middle but just got taller and taller. I think they are more likely to grow out of the rise of nappies than anything else.
this isn't to say that some children don't grow out of their nappies, some do and some people have to think about getting XL but I do think you will be surprised how their growth slows down and things that didn't fit or looked like they wouldn't last much longer seem to fit again.
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