After pregnancy, the body systems will change, the changes in the breasts are as follows: 1, the breasts are significantly larger than before pregnancy, is due to a large amount of estrogen and progesterone to stimulate the development of mammary ducts and breast follicles, individual pregnant women’s breasts can grow to 2-3 times larger than before pregnancy; 2, nipple and areola pigmentation, after pregnancy, under the action of various hormones in the body, the nipple areola darkening while increasing in size, can last until after delivery; 3, the Breast swelling and pain, after pregnancy, breast enlargement, engorgement is obvious, pregnant women feel breast swelling and pain and breast heating feeling; 4, secretion of milk, individual pregnant women squeeze the breast can be seen a small amount of milk secretion; 5, Montserrat nodules, black nodular bulge around the areola. Pay attention to breast cleaning and wear comfortable underwear during pregnancy.