I bought the 5T for my 4.5 year old daughter (35 pounds, 41 inches tall). There's definitely room to grow in length and width, so it's a bit big. Her waist and legs are so narrow that many 5T pants fall off immediately (but 4T is too short). That elastic waist feels like a good girth, but the legs appear taller/wider. But they are really cute, warm and comfortable. She loves them and I'm glad they have a little room to grow so they last a little longer.
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