Based on some of the other reviewers comments regarding sizing, I ordered the L/XL for my average size 4 1/2 year old.  Way too big!  It hangs about 3 inches on the floor and the sleeves have to be rolled up.  It'll eventually fit but I've ordered the S/M until then.

It is a very nice bathrobe.  Soft on the outside, terry on the inside.  Big hood, large pockets.  The color is true to the picture; a deep royal red.  Love it and so does the child!

Update:  The S/M is still big but manageable.  We roll the sleeves up about four inches and the bottom of the robe hits about mid-calf.  I'm very happy with how it looks after 6 months of use.