My son is 9 years old, about 54cm tall, 65lbs. I bought him a large one because they tend to shrink. It fits well without being too short or too high.
π Hanes Boys' Short Sleeve T-shirt Value Pack (3-pack) - Essential Wardrobe Basics
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Soft Brushed Fleece Crewneck Sweatshirt for π Boys and Girls 4-12 Years - Kid Nation Kids
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Boys' Adidas Active Sports Tricot Athletic Clothing
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π Bold Pack Sleeve Active Hoodie Sweatshirt Set for Boys' Clothing - Stylish and Comfortable!
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