Richie House Girls' Sweet T-shirt with Little Duck Size 2-8 RH2278 95%cotton 5%spandex 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 6 is for the average 5-6 year old,etc Cotton lends both comfort and durability, addition of spandex makes for a unique texture and drapes softly against the body for a comfortable fit and feel Paired with some leggings or cool denim, this top's angle sleeve and LITTLE DUCK are a sensation on little sweeties. It's crafted of light materials for a soft and comfy fit. Very cute color and style for young girls,fashion and leading the trends