"This costume is just adorable and my little guy absolutely loves it! I read most of the (many) reviews and decided it was in my best interest to purchase the size up because nearly every review complained about the size running so small. Well, I should have trusted my instincts. My three year old who wears a 3T was completely swamped by the bigger size. For some guidelines he's right around the 50 percentile for height and around the 10th or less for weight, so I guess some would consider that small for his age, but really for height he's right around average. I called and re-ordered the size 2T-4T and customer service was amazing. I didn't have to pay shipping and they exchanged it for me, crediting my account back for the other one since it was still brand new. Overall, sending anything back is a hassle, but this time it wasn't nearly as bad with everything emailed to me to print out and send back. New costume looks great, fits great, and we can't wait until Halloween!"