Fetal arrest is a diagnostic ultrasound term for a clinical diagnosis of an induced abortion. In most cases, the diagnosis is made at around 8-10 weeks of gestation, but there are cases where the fetus stops after 6 weeks of gestation when the fetal buds are seen and the fetal heartbeat is seen. If there is no abdominal pain or bleeding, the diagnosis may not be made until the NT ultrasound is done at around 12 weeks of gestation. The gestational week after the termination of pregnancy is the week of pregnancy measured by ultrasound, not according to the week of menopause. First, the ultrasound diagnosis of fetal arrest criteria include four situations: 1, fetal bud ≥ 7mm, no fetal heartbeat. 2, the average diameter of the fetal sac ≥ 25mm, no buds were seen. 3, Intrauterine pregnancy with no yolk sac visible and still no buds or fetal heartbeat after 2 weeks. 4.Yolk sac is visible in intrauterine pregnancy, and still no fetal heartbeat after 11 days. Secondly, if unfortunately the embryo has stopped, treatment is needed. At present, there are 3 main treatments for fetal arrest, expectant treatment, medication and surgery. These 3 methods have their own advantages and disadvantages. 1.Surgical treatment is usually negative pressure suction. The success rate of surgical treatment of abortion is 99%, the effect is exact, and the complication rate is low, mainly bleeding and infection. 2, drug treatment is generally taking mifepristone and misoprostol, through the action of drugs to let the pregnancy discharge itself, the success rate of 72-93%. Drug treatment requires several times to come to the hospital for checkups and follow-ups, and during the process of medication, there will be vaginal bleeding, cramping pain in the lower abdomen, accompanied by nausea, vomiting and other discomforts, and there is also the possibility of drug allergies. 3, expectant treatment is to wait for the pregnancy to be discharged naturally, can be observed for 1-2 weeks, once a week to do ultrasound, if more than 14 days has not been spontaneous abortion, it is recommended to no longer wait for it, it is recommended to choose other ways. During the period of expectant treatment, if there is more vaginal bleeding than menstruation, severe abdominal pain, or suspected infection, you need to consult a doctor. The success rate of expectant treatment is nearly 80%, with another 10% experiencing incomplete abortion and requiring emergency evacuation. Another approximately 10% did not want to wait and eventually opted for surgical treatment. Pelvic infection is less likely to occur with expectant treatment than with surgical treatment. Herbal medicines such as Wu Jia Biochemistry Capsule, Motherwort and Biochemistry Soup can be used during expectant treatment to facilitate the expulsion of the pregnancy. Each of these three treatments has its own advantages and disadvantages. Surgery is the traditional treatment for early-stage induced abortion. It is quick and easy to perform, and you can tell whether the tissue has been removed or not right after the surgery, with 99% efficacy. However, surgical treatment is invasive and can lead to various immediate and long-term complications. Medication is non-invasive, but it has a long bleeding time, requires repeated visits, has the potential for failure and uterine residue, and has been reported to have severe drug allergic reactions. The success rate of expectant treatment is close to 80% with less risk of comorbidities, but there is a risk of unplanned surgical treatment and hemorrhage. Third, because 50-60% of the abortions are caused by the problems of the embryo itself, it is recommended to send the outflow of the pregnancy to a chromosome and gene copy number variation monitoring, for the reference of the next pregnancy. Fourth, after the treatment of abortion, pay attention to rest, keep warm, clean and dry vulva. It is not recommended to have intercourse in the same month. Ovulation will resume in about 2 weeks. You can have intercourse after 1 period, but contraception is required. After 3 periods, you can start pre-pregnancy test and take a small dose of oral folic acid. After 6 periods, you can start trying to conceive without contraception. Fifth, if it is the first time of abortion, it is usually caused by incidental factors, not a recurrent abortion, no need to do special examination. If you have had more than 2 missed abortions, you should consider recurrent abortion, and we recommend that you undergo the examination of the causes of recurrent abortion.