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While we all know our breasts grow when preparing for a child, you may not know your breasts always vary in size during menstrual cycles. During any given menstrual cycle your breast volume can vary by 13.6 percent! This is due to water retention and cell growth. Typically your breasts weigh over a pound, but that can change a little bit during your menstrual week.
So next time you think your breasts might be a little heavier, they probably are!