The size of the uterus is related to age and childbirth. Under normal circumstances, the uterus is inverted pear-shaped, with a length of about 7.5cm, a width of about 4.5cm and a thickness of about 2.5cm when the uterus is unborn. It is best to go to a regular hospital for ultrasound examination, the examination is relatively accurate, the ultrasound examination of different hospitals will have a certain error, the size of the uterus will be different for each person’s development, the main difference is not large is normal, will not affect the health, will not affect fertility. If the uterus is too small, it will cause low menstrual flow, partly due to congenital development, which does not necessarily affect fertility or fetal development and can lead to normal pregnancy and childbirth. If the uterus is too large, it may be fibroids, and gynecological inflammation can also stimulate the uterus to cause large, and needs to be treated reasonably according to the specific circumstances.