I had a medium side snap from WN that never really fit Imogen it was too tight round her waist & I had to sell it on by the time she was 4 mths , does anyone have a Large with a standard rise who could tell me how they compare to a medium or be able to show me a pic?? It's strange as the med NL fit her perfectly.
Have you got any large side snaps or AI2s? They're exactly the same size, only 2 inches shorter. I don't have any mediums anymore to compare but Mediums still fit Katie on the 2nd loosest poppers and Ls with standard rise fit her on the tightest poppers. They're a perfect fit for her atm.
We have had problems with med WN only plain NL med fit but have had great sucess with a large with med rise SS, waist is a bit big but ok but other than that it is a great fit on tightest snaps. On meds she was on tightest 2nd waist and between 2nd tightest and tightest on the legs. I know Hanna has had similar problems and uses the large with smaller rise also.
Probally not much help but gives you some idea of sizing.