We have used different manufactures for our shirts, therefore we have simplified the sizing chart based on your childs weight. Please note that our girls shirts run small, therefore please size up if she is on the border. Also because of the varying manufacturers, the number on the shirt may not correspond to the size ordered. For instance, a girls 4T shirt may have a tag that says 5/6 because the 5/6 for that particular manufacturer corresponds to a 4T.