I purchased this as a birthday gift for my 4 year old niece. I sized up to a 5/6 and was so glad that I did! It runs on the smaller side, but this will definitely last her a year or so. It's an adorable hoodie and I love the sparkle on the front, the wings, and the accents on the hood. She was so excited when she opened it as Twilight Sparkle is her favorite pony.