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 41417
Juvenile 5-61518
Juvenile 71619
Toddler 2T - Red1215
Toddler 3T1215
Toddler 4T1316