S (4 to 6): height 39 to 46", weight 35 to 45 lbs, waist 19 to 22", chest 22 to 25" M (8 to 10): height 49 to 54", weight 55 to 73 lbs, waist 23 to 25", chest 27 to 30" L (12 to 14): height 55 to 60", weight 74 to 100 lbs, waist 24 to 26", chest 30 to 32"