What effect does fluid in the gestational sac have on the fetus is related to the specific condition of the mother, some patients have no special effect on the fetus, and some patients can lead to fetal miscarriage. If the patient’s gestational sac has fluid accumulation, the amount is relatively small, the fetus develops well, the pregnant woman has no abdominal pain, no vaginal bleeding and other discomforts, and the uterine orifice is not open, the patient’s condition can be temporarily observed, and the fetus of some patients can develop normally without any adverse consequences. If the patient’s gestational sac has effusion, the amount is relatively large, the fetus is not well developed, the pregnant woman is accompanied by abdominal pain, vaginal bleeding and other symptoms, and the mouth of the uterus has opened, which can lead to fetal abortion. When pregnant women have abnormalities in obstetrics, they should undergo standardized treatment under the guidance of professional physicians as early as possible to avoid delaying the condition and leading to adverse consequences.