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Hormonal Fluctuations
Like we mentioned, increased estrogen in the body can boost your cup size, and nothing boosts your estrogen better than pregnancy. "One of the benefits of pregnancy is larger breasts, since estrogen can stimulate milk glands and ducts to grow," says Dr. Angela Jones, an OB-GYN and Astroglide's resident sexual-health adviser. Estrogen isn't the only hormone present during pregnancy that plays a role. Progesterone and prolactin help as well, Jones says.
Birth-control pills and other means of contraception can also help "due to the extra hormones, like estrogen and progesterone," Jones says. While low-dose estrogen pills will still have some effect, you'll get a bigger boost with a high-dose pill like Yaz or Yasmin.
"It's not uncommon to notice a slight increase in breast size around the time of your period, too, primarily due to the slight weight gain that most women experience around that time of the month," the doctor explains. That temporary weight gain is — you guessed it — also related to hormonal changes.
