Apart from the "just been smacked in the face by a cricket bat" look, she's very similar how I looked around age 13, along with a good 50% of my friends at that age, although I personally did have the most humungous knockers.

Although we did usually wear bras.

This child though looks to be about a FF or even GG cup size which is extremely uncommon without a) surgery or b) obesity - at any age.

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire