Children’s Size Children’s Size Chart Chest Measurement Finished Garment Measurement Size 20″ 22″ 6 – 12 months 21″ 24″ 12 – 18 months 22″ 26″ 2 years 24″ 28″ 4 years 26″ 30″ 6 years 28″ 32″ 8 years 29″ 34″ 10 years 31″ 36″ 12 years 33″ 38″ 14 years