The 45-day spontaneous abortion gestational sac is white transparent pom pom-like tissue. In early pregnancy, due to the unstable development of the embryo, it is necessary to pay attention to proper rest and avoid strenuous exercise and coitus. However, when the embryo itself is not developing well or the mother has a combination of serious infections, high fever diseases and other systemic diseases, it may lead to spontaneous abortion. At 45 days after menopause, the gestational sac is a white, transparent, chorioallantoic tissue, accompanied by flakes of meconium and vaginal bleeding. Early pregnancy must pay attention to avoid contact with toxic and harmful substances, such as radiation, formaldehyde and other chemical substances, but also pay attention to the occurrence of abdominal pain, vaginal bleeding and other conditions should go to the hospital in a timely manner, ultrasonography, blood HCG (human chorionic gonadotropin) test and progesterone test to understand the development of embryos, and active symptomatic treatment, to avoid the cause of inevitable miscarriage.