First and foremost - order at least one size larger!  We have purchased two of these for a 4-year-old of average size.  The first was a Child's 4-6, which fit more like a Size 2 - the feet of the costume hung right below her knees (and the paws rested on her forearms).  I ordered a Size Medium (8-10) and plan to return the Small.  The Medium is only slightly larger!  Crazy that a little 4-year-old needs to buy a costume Sized 8-10.  If you are ordering close to Halloween, be careful - bigger is better!  Quality is fine.