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 - Bright Yellow13.518.5
Juvenile 5-6 - Bright Yellow1519
Juvenile 7 - Bright Yellow1620.5
Toddler 2T - Bright Yellow1014.5
Toddler 3T - Bright Yellow11.515.5
Toddler 4T - Bright Yellow12.516