My son is 3 years old and wears 3T shorts and 4T shirts cause hes very tall and thin. Usually we have trouble buying his clothes because 3T pants are too big around the waist and too short length wise. I had to purchase over 100 dollars worth of underwear before finally coming across the BUM equipment boxer briefs he now uses and loves. I bought him the 4T in these and they almost cut off his circulation around the legs and once you wash them, they are definitely too small. What a waste of money, although they are cute.