My son is under 15 months old but has wide hips (21 pounds). Although the 18-month shirt fits him perfectly, the pants are way too tight for him. I might go 2 sizes up for kids who are a little smaller for their age, and maybe even 3 sizes up for bigger kids. Overall I love this garment. It is well made and I may buy a larger size in the future.
Snug-Fit Cotton Pajama Sleepwear Sets for Kids featuring Disney, Star Wars, and Marvel by Spotted Zebra
54 Review
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
44 Review
π Snug-Fit Sleepwear for Boys: Amazon Brand - Clothing, Pajamas, and Robes
55 Review
π₯ Stay Warm and Active with Rocky Fleece Thermal Underwear Bottoms for Boys
44 Review
Boys' Adidas Active Sports Tricot Athletic Clothing
45 Review
Arctix Youth Pants Reinforced: Large Boys' Clothing for Active Adventures
46 Review
π Fruit of the Loom 6 Pair Cushion Ankle Boys' Clothing: Comfy and Stylish Selection for Active Boys
57 Review