My 2 yr. old son of average weight and height got the 2-4 size and loved this! It was really cute.  The wings flop down ---not as pictured, but it was too cute.
 I bought two other dragon costumes TO COMPARE and THIS ONE WAS THE BEST--not too hot, the hat/head did not get in his vision at all,  very comfortable material, realistic but not too scary and just the right amount of ADORABLE!:)