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And, if you choose to breastfeed, you may continue to notice a fullness in your breasts for months after giving birth.ĭata collected from an older questionnaire about breast changes after giving birth found that of the 559 people who replied, a decrease in breast size was reported in 21.8 percent, but an increase was reported in 31.5 percent ( 5).įinally, those pesky hormones that fluctuate throughout the month can play a role in how full or swollen your breasts feel. This is due to an increase in the hormone progesterone, which play a key role during pregnancy ( 3).Īs your pregnancy progresses, you will begin to secrete prolactin, a hormone that causes milk production and breast growth ( 4). Unless you’re taking daily pregnancy tests, enlarged breasts may be one of the first signs that you’re pregnant. Researchers from one study that looked at the relationship between breast size and aspects of health reported that, of the 269 participants aged 40 to 85, 61 percent noted an increase in breast size after menopause, while 20 percent stated a change in breast shape ( 2).

So, if you gain weight and have a larger amount of fatty tissue, you may see an increase in breast size.Īnother thing that impacts your breast size is age. Fatty tissue is what largely determines the size of your breasts ( 1). Your breasts contain fatty tissue, glandular tissue, and supportive tissue. Instead, the shape and size of your breasts is a combination of: Unless you’ve had plastic surgery to enhance the size of your breasts, there’s no single factor that influences breast size.
