When it comes to individual pairs of breasts, the size-related variables continue.
Weight changes, medications, pregnancy and menstruation can all incite fluctuations, but breast size is largely determined by seven genetic markers [source: Erikkson et al].
You will also find a bra sizing guide, to find your correct US size.
Bras therefore come in an alphabet of sizes and styles because every woman inherits a unique set of breast-related DNA from her parents' genes.
And even though breasts are typically considered identical pairs, size differences exist not only from woman to woman but also, quite often, from breast to breast.
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As young girls, many of us imagined how we would look and be when we grew up.