Had to order these three sizes. Our 3 1/2 year old son usually wears 3T in his underwear. We had to go X-Large so it wasn't tight around the waist. This isn't fat but it's big for his age - 40" tall and about 40 pounds) we should have ordered two sizes up. He LOVES his "boxers"! His dad and he are so happy with them! They're off soft material, good quality and no logos or prints anywhere. Hope your kid will like them too! :)
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