Mediums last my kids for aaaages. Kane wore them till around 19 months, and Harmony has been in them from about 11 weeks.... I can still get one on Kane without leaks if need be!!!
My DD started to wear medium sized nappies from around 3 months (and even then was not on the tightest snap) and is still in them now at 11 months (she is about 9 and a half kilos) with alot of space to go (she is only about half way through the snaps). I dare say she will be in them still at the end of the year as her baby fat fades and she gets leaner as she becomes more mobile (she does not walk or crawl yet).
I think that if you are looking at sized nappies, buying a 'medium' you should get 12 months wear out of them, sometimes less or more, depending on the childs build of course.
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