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 4 - White1415.5
Juvenile 5-6 - White1417
Juvenile 7 - White16.516.5
Toddler 2T - Navy Blue1313.5
Toddler 2T - Royal Blue12.514
Toddler 2T - White1214.5
Toddler 3T - Navy Blue13.516
Toddler 3T - Royal Blue13.514
Toddler 3T - White1315
Toddler 4T - Navy Blue
Toddler 4T - Royal Blue14.516
Toddler 4T - White1416.5