Ordered 4T for my son who just turned 4 - they definitely run big but otherwise a big tight overall. It sits high in the waist and wide in the back. We have other baby underwear options that fit better. They are similar in size to soft training underwear on the market.
π¦ Top-rated Under Armour Performance Briefs Graphite for Boys - Trendy and Practical Sportswear
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Stay Warm in Extreme Cold with Rocky Thermal Underwear for Boys - Long Johns Set: Shirt & Pants, Base Layer with Leggings/Bottoms for Skiing
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π Boys' Cotton Tank top Undershirt (Multipack) by Fruit of the Loom
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Blippi 7PK Boys Briefs Multicolored - Comfortable and Colorful Underwear for Kids
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Boys' Adidas Active Sports Tricot Athletic Clothing
45 Review
Arctix Youth Pants Reinforced: Large Boys' Clothing for Active Adventures
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π₯ Stay Warm and Active with Rocky Fleece Thermal Underwear Bottoms for Boys
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π Boys' Outdoor Climbing Convertible Trousers - Waterproof | Clothing
47 Review