Purchased Pink/White Fairy 7 Pack Briefs in age 3-4. Already age 5-6 but are abit big and because my daughter keeps complaining about a wedgey front and back (she is only 4 so I no at this age they are super sensitive and I have to cut labels out of everuthing atm) but when I have got the smaller size the length is the same but the width is smaller so a disaster and bcos cut labels out I can't return. Never had a problem with her m&s knickers although these are longer in length which I love. Would recommend but think sizing needs looking at and also where the seam is positioned by your private maybe better to be at the bum part. If that makes sense. Also don't stock inbetween ages like a 4-5