I'm not the best person to ask, but I have read from the ladies here that sized nappies are better for a better fit. I have only a few sized nappies but mostly OSFA as I have an 18 month old and another on the way and I wanted nappies to do them both. But looking at the ones I do have they would fit from birth to toilet training as they have fold down bits for n/borns and then graduated snaps for bubs getting bigger to eventually just using the nappy as it is when they are full grown. In saying that I am going to use bamboo prefolds (rectangles of soft bamboo fleece folded) with a nappy cover for the first while with the new baby as they will be smaller, and then once baby has put on a kilo or two, use the OSFA nappies. I mostly chose OSFA for financial reasons..
I find the sized nappies are a better fit on both of mine because they are both quite long and slim and suit a narrow crotched nappy. Most of the OSFA all all pretty wide, so it was hard at first with Miss M to get a good fit. Plus her legs were pretty much chicken legs, so leg seal was a problem!!!! The best ones I found were bumg's or hautes on her.
I use mainly OSFA on DS though - and he's 2.5 (nearly) so they really do last under they are toilet trained. However, I do stress that he is 13.5 kg and quite slim - he can still fit into most mediums, so I would expect him to fit into OSFA until he's like 5 or something.. lol
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