Uscg Approved Sizing For Infant/Child/Youth Pfd'S Uscg Approved Children'S Life Jackets Are Labeled For Infant Child Or Youth And Generally Weight Can Be Used As An Approximate Guide Actual Comfort Fit And Sizing Will Vary When The Vest Pfd Is Securely Fastened It Should Not Rise Above The Child'S Head! Infant Size Pfds 8–30 Pounds (If Weight Is 8-25 Lbs — Try This Size ) Approximate Child'S Chest 16-20 Inches (40-50Cm) Child Size Pfds 30–50 Pounds (If Weight Is 25-45 Lbs — Try This Size ) Approximate Child'S Chest 20-25 Inches (51-64Cm) Youth Size Pfds 50–90 Pounds (If Weight Is 45-85 Lbs — Try This Size ) Approximate Child'S Chest 26-29 Inches (66-74Cm).