Width is measured across the chest below the sleeves from seam to seam. Height is measured from the bottom of the shirt to the highest point on the shoulder (where the seam meets the neck).

Please note that each product has its own specific sizing chart.
SizeWidth (inches)Height (inches)
Girls Small (6/7) - Baby Pink12.519
Girls Medium (8-10) - Baby Pink13.520.5
Girls Large (12-14) - Baby Pink1523
Girls XL (16) - Baby Pink1625.5
Girls 4 - Baby Pink11.518
Girls 5-6 - Baby Pink1219.5
Girls 6X - Baby Pink1320.5