All of a sudden my green kids nappies are leaking around the legs. DD has just started crawling properly and is constantly on the move so I don't know if its her increased movement, or if all of a sudden she is doing bigger wees. It seems that one week she was lasting up to 5 hours per nappy (I was changing her every 4 hours, and she always had dry skin and no leaks), to having to change her every 2.5 hours or so, otherwise they're leaking.

Any ideas?