Amscan Boys Size Chart

 Size Height Chest Waist Weight
Small(4-6) Up to 44" 24" 23" Up to 55 lbs.
Small/Mediuim Up to 54" 27.5" 25.5" Up to 75 lbs.
Medium(8-10) Up to 54" 27.5" 25.5" Up to 75 lbs.
Medium/Large Up to 61" 30.5" 28" Up to 95 lbs.
Large(12-14) Up to 61" 30.5" 28" Up to 95 lbs.
X-Large(14-16) Up to 63" 32" 29.5" Up to 120 lbs.