Breast growth is a common and expected change during pregnancy. It is a result of hormonal changes in the body, specifically an increase in the hormones estrogen and progesterone. These hormones cause the milk ducts in the breasts to grow and the glandular tissue to increase, which can lead to an increase in breast size.

Breast growth during pregnancy can occur as early as the first few weeks and may continue throughout the pregnancy. The degree of breast growth can vary from woman to woman and can also depend on factors such as weight gain, genetics, and previous breast size.

In addition to breast growth, women may also experience other changes in the breasts during pregnancy, such as tenderness, sensitivity, and darkening of the nipples and areolas. These changes are also a result of hormonal changes and are normal during pregnancy.

It is important to wear a supportive bra during pregnancy to prevent discomfort and sagging, as well as to accommodate changes in breast size. After pregnancy, breast size may decrease as hormone levels return to normal and milk production ceases. However, some women may experience permanent changes in breast size and shape after pregnancy.

Breast growth during pregnancy typically occurs in the first trimester and can continue until the end of the pregnancy. However, breast growth may slow down or stop after the first few months, and some women may not experience much change in breast size at all.


  • During the first trimester, hormonal changes may cause breast tenderness and sensitivity, and the breasts may feel fuller and heavier. The areolas may also darken and the nipples may become more erect.
  • In the second trimester, the breasts may continue to grow as the milk ducts and glandular tissue continues to develop. Some women may also start to produce colostrum, which is the first milk that the baby will receive after birth.
  • In the third trimester, the breasts may become even larger and heavier, and the areolas may become even darker. Some women may also start to leak small amounts of milk from their breasts as the body prepares for breastfeeding.


  • After giving birth, breast size may increase further as milk production begins. This is known as engorgement and typically occurs in the first few days after birth. As the baby begins to breastfeed regularly, milk production will regulate and breast size may decrease.
  • During the weaning process, breast size may gradually decrease as milk production slows and eventually stops. It is important to wear a supportive bra during this time to prevent discomfort and sagging. It is also normal for breasts to return to their pre-pregnancy size and shape after weaning, although some women may experience permanent changes in breast size and shape.


Breast growth during pregnancy and breastfeeding is a natural and normal process, and it can vary from woman to woman. It is important to remember that breast changes are a sign that the body is preparing for the arrival of a new baby and to provide nourishment for the baby after birth. It is also important to seek medical advice if any breast-related concerns arise during pregnancy or breastfeeding, such as breast engorgement, to ensure the health and well-being of both the mother and baby.