After pregnancy, the more significant changes in internal organs are the uterus and the heart, which will gradually increase in size; the heart’s6 capacity will also increase compared to the time when there is no pregnancy. During pregnancy, as the fetus grows and develops, the uterus will gradually increase in size from the time of conception, and if the uterus is in the late stages of pregnancy, the volume of the uterus will generally increase by 500 to 1,000 times compared to the time when the fetus was not pregnant, and the weight will generally increase by 20 times compared to the non-pregnant period, and at the same time, blood flow to the uterus will also increase to provide oxygen and nutrients to the fetus. There are also changes in the heart during pregnancy, with the heart’s output and volume increasing compared to when you are not pregnant. The respiratory system and kidneys of a pregnant woman also undergo some corresponding changes to better adapt to the state of pregnancy. All the major organs of the body undergo various changes after pregnancy, so it is important to monitor the pregnancy, go to the maternity checkups on time, and consult the doctor when there are any abnormalities.