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

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