Just go the the web site that sells the shirts and go to the size charts and do a comparison.
Size guide, baby clothes
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Size guide, toddlers and kids (girls and boys)
Sizing Guide for Youth Shirts. If you are selecting sizes for an older adolescent or a young teenager, be aware that youth extra large does not correlate to an adult small. A youth extra large shirt is wider and shorter proportionally than an adult small shirt. If you are on the fence about whether to order a youth extra large or an adult. Youth large is equivalent to size 12 to 14 in children. Some brands vary in size slightly so each one may fit differently. Letters or numbers are typically used to denote pant and shirt sizes. Men's T-Shirt Size Chart. Men's T-Shirt Sizes: SIZE WIDTH LENGTH; inch cm inch cm; SMALL: MEDIUM: