The uterus provides the environment for the growth and development of the foetus, so the function, structure and morphology of the uterus directly affects the ability to conceive and the development of the foetus. In patients with a small uterus, there is a large gap between the shape, structure and function of the uterus and a normal uterus, which does not provide the normal nutrition and environment for the fetus to grow and develop, and therefore can easily lead to infertility or miscarriage after pregnancy.