First: Measure from your child’s collar to his belt line. (Measure while your child is standing. Measure an infant as if he were standing.)
Second: Pick the closest size to your measurement. (Generally speaking, ties can hang an inch or two long and look fine.)
Child sizes are recommended as follows:
Infant (7.5”): 0-9 months
Toddler (10”): 9 months -2T
Boy (14”): 3T-Child size 6
Youth (17”): Child size 7-9
It should be noted that when ties are on infants and toddlers they need constant adult supervision.
Men sizes are recommended as follows:
Dad (59”): Up to 6’2” tall
Tall (65”): Over 6’ tall