My daughter usually wears child sizes 14-16, she is 11 years old, 5.1ft tall and weighs 111 pounds. So I was debating whether to go for 14 or 16. (Thanks for the feedback section! I read them all which helped me decide). We have 16 and it fits perfectly! Since the dress is quite stretchy, I'm sure a 14 would fit. However, I'm happy with the 16 as it hugs the body well (loose but not baggy). The quality is good too.
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