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 - Baby Pink11.514.5
Toddler 3T - Baby Pink1215.5
Toddler 4T - Baby Pink1216
Infant 12M - Baby Pink9.513
Infant 18M - Baby Pink10.513.5
Infant 24M - Baby Pink1114