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)
Toddler 2T - Bright Orange1215
Toddler 3T - Bright Orange12.515.5
Toddler 4T - Bright Orange13.516