Measuring Guide
To choose the correct size for you, measure your body as follows:
Chest
Measure a loop under your child's armpits, passing the tape across the fullest part of the chest and around the shoulder blades.
Waist
Measure a loop just above your child's hip bone, around the natural waistline.
Torso
Measure a loop from your child's shoulder, at the base of the neck, down the front of the body to the crotch and back up the other side.