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)
Juvenile 5-6 - Kelly Green17.520
Juvenile 5-6 - Red1721
Juvenile 7 - Kelly Green18.521
Juvenile 7 - Red1821