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Size Age Chest (IN) Waist (IN)
YXS 6 25.5-26.5 23.5-24.5
YS 8 26.5-27.5 24.5-25.5
YM 10 27.5-29.5 25.5-27
YL 12 29.5-32.5 27-28.5
YXL 14 32.5-35 28.5-30
Size Age Chest (CM) Waist (CM)
YXS 6 64.8-67.3 59.7-62.2
YS 8 67.3-69.8 62.2-64.8
YM 10 69.8-74.9 64.8-68.6
YL 12 74.9-82.5 68.6-72.4
YXL 14 82.5-88.9 72.4-76.2

Source: Mizuno youth clothing size chart. Centimetre measurements are converted from the supplied inch values.