You may want to order one size up! My boys are 5 and 3 years old and small for their age (50th and 30th percentile respectively). I bought a size 5-6 which fits snug but not too tight. And the 3T, which is honestly too small, but we just tugged at it to make it work. The quality is there. The colors are bright. They are comfortable and kids love them. But definitely get one size bigger.
Amazon Essentials Snug Fit Pajamas - Stylish Boys' Sleepwear & Robes Collection
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Enfants ChΓ©ris Toddler Pajamas: Warm Cotton Pjs for 24M-6 Year Old Girls Boys
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VAENAIT BABY Viscose Toddler Pajama Set - Short Soft Shirring Cool Sleepwear for Boys and Girls, Ages 12M-12Y - 2pcs Set
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Snug-Fit Cotton Pajama Sleepwear Sets for Kids featuring Disney, Star Wars, and Marvel by Spotted Zebra
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π Bold Pack Sleeve Active Hoodie Sweatshirt Set for Boys' Clothing - Stylish and Comfortable!
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Waterproof Cozy-Dry Rain/Snow Pants for π§ Kids by JAN & JUL, with Fleece Lining
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Arctix Youth Pants Reinforced: Large Boys' Clothing for Active Adventures
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Funny Guy Mugs Tearaway Sweatpants: Playful Boys' Clothing for Fun and Active Days
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