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 - Sky Blue1115
Toddler 3T - Sky Blue11.515.5
Toddler 4T - Sky Blue1216.5
Infant 12M - Sky Blue1013
Infant 18M - Sky Blue10.514
Infant 24M - Sky Blue10.514