Miscarriage before 12 weeks of gestation is called early miscarriage. The following high-risk behaviors in early pregnancy can lead to miscarriage: 1, age: the probability of miscarriage is higher for pregnant women of advanced age. 2, improper diet: pregnant women should not use cinnamon, barley, crab, etc., which can easily cause miscarriage. 3, pregnant women or their partners have a history of genetic diseases (genetic gene defects): one of the women has chromosomal abnormalities, it can be transmitted to the offspring, which can lead to miscarriage or repeated miscarriages. Therefore, it is advocated to do premarital examination to avoid regretful occurrence. 4, bad habits: such as smoking, alcoholism, excessive coffee and drug use. 5.Vigorous exercise: In early pregnancy, the development of the fetus is unstable and the physical condition of the pregnant woman is also unstable. At this time, pregnant women should not engage in vigorous exercise and avoid intercourse to avoid miscarriage. 6, endocrine abnormalities: such as luteal insufficiency, low thyroid function, diabetes is not well controlled, etc. 7, environmental pollution: such as formaldehyde, benzene, lead and other harmful chemicals. So the newly renovated house pregnant women should not live. 8.Severe nutritional deficiency of pregnant women. 9, pregnant women improperly dressed: pregnant women should follow the clothing soft, wide, do not carry a bundle of abdominal, do not wear tight pants, and do not wear high heels. Otherwise, it is easy to lead to miscarriage. And high heels will also lead to leg fatigue, which is not good for the health of pregnant women. In order to prevent miscarriage in early pregnancy, it is recommended to do preconception checkups, consult eugenics clinics and prepare for pregnancy in a state of good health for both couples.