Really beautiful dress and at a very good price, but runs a bit small. The size 4 I bought my three-year-old daughter is smaller than a size 3 party dress I got at Costco, for example. My size 12 wearing daughter's dress was also small. I bought these for Easter so I can't try them on yet but pulled out my two daughters' dresses and both dresses were smaller than their dresses of the same tagged size. If the girl you are buying for is small for her size, she'll be fine, but if you are on the line or the child grows quickly, I'd size up. I would say they were at least a half size smaller than the other dresses with which I compared the seams.
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