My son just turned 7 and I believe he is 7.5 to 8 years old (51 inches and 60 pounds) . I ordered an xs but it was too small so I ordered a small and it fits great. He can even get away with an M with his sleeve rolled up. These shirts are great for outdoor sports and layering. My son loves everything under the armor but he loves them too and I have so many colors!
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