Richie House Girls' Sleeveless Dress with Floral Bottom Size 4-10Y RH2177 100%cotton&100%polyester Lining:100%cotton A size 2/3 is for the average 2-3 year old girl, a size 5/6 is for the average 5-6 year old girl, a size 9/10 is for the average 9-10 year old,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.