Richie House Big Girls' Princess Party Dress with Diamond Brooch RH2310 Size 2-8Y 100% Polyester Lining: 100% Cotton A size 4 is for the average 3-4 year old girl, a size 5 is for the average 4-5 year old girl, a size 8 is for the average 7-8 year old kid, etc. For a day spent outdoors or an afternoon with pals, this dress is great for little sweeties. Little ladies will be the belle of the ball donning this darling dress. SIZES FOR LITTLE AND BIG KIDS ARE BOTH AVAILABLE, PLEASE CHECK THE OTHER LISTING IN THE OTHER SIZE RANGE