Immediately after delivery, the breasts become larger as they fill first with colostrum and then with milk; most will stay that size for a few weeks.
Breastfeeding mothers will experience enlarged breasts for as long as they nurse exclusively. The whole process, including being pregnant, causes most women’s breast tissue to stretch, whether they breastfeed or not.
“Once pregnancy and nursing end, most women lose breast volume, retain stretch marks and experience some sagging,” says Robert Brueck, M.D., a Fort Myers, Fla.-based board-certified plastic surgeon with 30 years of experience in mommy makeovers. The nipple may also look displaced.
Most women accept the changes in their breasts as a rite of passage to motherhood. Some may want to do exercises to firm up the chest wall behind the breasts, “lifting” them a bit.