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As breasts are mostly composed of adipose , their can change over time if the gains or loses weight. It is also typical for them to grow in size during pregnancy and whilst , mainly due to hypertrophy of the mammary gland in response to the hormone prolactin. The size of a woman’s breasts usually fluctuates during the menstrual cycle, particularly with premenstrual retention. An increase in size is also a common side effect of use of the contraceptive pill.

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