My daughter has been wearing the Capezio Pirouettes for yrs. now. And now she only wears one, on her turning foot. She wears a womens size 5-5.5 shoe now & since wearing a size 4 in girls, she has preferred the Lg. She has a little bit of a wide foot. However, I am a womens  8.5-9 & I could put the M size on. I tried to show her once that she could still wear the M, but she prefers the Lg. Hate to be confusing, but if your child is in a girls size 4 to womens size 9, the Lgs will fit just fine.  I made the mistake & bought the XL yrs ago, thinking they were child sizes & they are huge! Size 9+ adult! So again, these are the adult shoes, but children to adults do wear this model. HTH!