I found this recently about the fuzzi's...http://www.justmommies.com/forums/f396- ... s-new.html
I was a huge small old style fuzzi fan - fitted brilliantly when DS was small.
Mediums were ok, still worked, but his shape changed a little when he got mobile
The larges were a no, no because of his skinny legs.
Hope the link helps - the photos show really well the difference between them