The main change is the enlargement of the breasts, the mild local swelling and pain, the softness of the breasts, the difference in touching, and the coloring of the nipples and areolas, which are normal clinically. This is mainly due to the change of hormone level in the body after pregnancy, and the increase of estrogen and progesterone, so it will lead to the corresponding changes in the local breast. It is recommended that during pregnancy, you should take better care of your breasts and wash them with warm water every day. If there is mild nipple invagination, it is advisable to do local hot compresses and then gently pull the nipples, which will help the newborn to breastfeed after delivery.