Richie House Girls' Short Sleeve Dress with Bow Size 2-12Y RH0721 95% Cotton 5% Spandex & 100% Cotton Little ladies will be the belle of the ball donning this darling dress. 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 Designed to look like a tee-and-dress combo, this easygoing outfit offers all-in-one convenience and a comfy fit courtesy of its all-cotton construction. Cotton lends both comfort and durability while the addition of spandex makes for a unique texture that drapes against the body for a comfortable fit and feel.