My daughter is nine, but she is big for her age. She is about 5 ft. tall and weighs about 110 pounds. She is a little curvy already. This leotard is a great color, it washes nicely and fit her well. I am glad I sized up (A LOT) and got the medium. She normally wears a size 16 girls if that is any idea of how small this runs. So beware...no vanity sizing here, but it is a great leo.