The breast size of women after pregnancy may become smaller again after abortion, because the breast size of women after pregnancy is mainly caused by the change of hormone level in the body, the estrogen and progesterone level in women’s body will be significantly increased after pregnancy, and estrogen and progesterone can effectively promote the secondary development of the breast, so it is felt that the breast will be slightly enlarged during pregnancy. However, after the abortion, the estrogen and progesterone levels in the body will slowly return to normal with the termination of pregnancy, and the size of the breasts will also recover with the changes in the hormone levels in the body, so the slight increase or decrease in the size of the breasts during pregnancy is a physiological change that does not directly affect the size of the breasts. Some slight enlargement will eventually return to normal size.