Ok I bought a size 9-10 for my 7 year old: he is 51 inches tall and weighs 55 pounds. Slender build, I'll add if it's not obvious. these shirts fit him. I was confused, I checked the size on the internal unmarked print a few times just to make sure I was seeing it right. They would reach the size of a child and the color fades quickly.
Van Heusen Sleeve Dress Poplin
42 Review
π Hanes Boys' Short Sleeve T-shirt Value Pack (3-pack) - Essential Wardrobe Basics
44 Review
Boys' Long-Sleeve Disney Star Wars Marvel T-Shirts by Spotted Zebra
46 Review
Star Wars, Marvel, and Disney Short-Sleeve T-Shirts for Boys from Amazon Essentials
50 Review
Boys' Adidas Active Sports Tricot Athletic Clothing
45 Review
π Fruit of the Loom 6 Pair Cushion Ankle Boys' Clothing: Comfy and Stylish Selection for Active Boys
57 Review
π Bold Pack Sleeve Active Hoodie Sweatshirt Set for Boys' Clothing - Stylish and Comfortable!
47 Review
Arctix Youth Pants Reinforced: Large Boys' Clothing for Active Adventures
46 Review