According to the company that sells swimwear on our swim team, you need to measure the boy's waist to determine the size of the swimsuit to order.
I think we ordered 28 for my six year old who is a little heavy (husky clothes are too big but regular clothes are a little tight). It has a durable feel and the bright color makes it easy to find in a bag.
๐ฉฒ Boys' Protective Swimming Bottoms by City Threads - Swimwear for Enhanced Safety
56 Review
๐ Large Boys' Clothing - Kanu Surf Stripe Trunk
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๐ Kanu Surf X Large Boys' Swim Rashguard Sleeve - Premium Protective Clothing for Swimming
43 Review
Pineapple Print Medium Boys' Spotted ๐ Zebra Shorts - Trendy Clothing for Kids
52 Review
๐ Bold Pack Sleeve Active Hoodie Sweatshirt Set for Boys' Clothing - Stylish and Comfortable!
47 Review
Waterproof Cozy-Dry Rain/Snow Pants for ๐ง Kids by JAN & JUL, with Fleece Lining
64 Review
Funny Guy Mugs Tearaway Sweatpants: Playful Boys' Clothing for Fun and Active Days
49 Review
Arctix Youth Pants Reinforced: Large Boys' Clothing for Active Adventures
46 Review