My grandson was visiting from Florida for Christmas so I bought him a pair of pajamas, they fit but just fitted, luckily he's slim I would buy 2 sizes bigger.
VAENAIT BABY Viscose Toddler Pajama Set - Short Soft Shirring Cool Sleepwear for Boys and Girls, Ages 12M-12Y - 2pcs Set
48 Review
Amazon Essentials Snug Fit Pajamas - Stylish Boys' Sleepwear & Robes Collection
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Snug-Fit Cotton Pajama Sleepwear Sets for Kids featuring Disney, Star Wars, and Marvel by Spotted Zebra
54 Review
VAENAIT BABY Kids' Soft and Comfy Modal Tencel Sleepwear Set for Boys and Girls - 12M-12Y, Shirring Solid Pajamas
46 Review