When there are embryonic chromosomal abnormalities, improper sexual lifestyle, poor nutrition, mood swings, etc., women in early pregnancy are more likely to cause miscarriage, as follows: 1. Embryonic chromosomal abnormalities: usually include chromosomal number abnormalities, such as chromosomal trisomy or tetraploidy, and also chromosomal structure abnormalities, such as chromosomal breaks or deletions, which are common causes of miscarriage in early pregnancy; 2. Sexual life Improper way: early pregnancy embryo is in the development stage, the connection between the placenta and the uterine wall is not solid enough, if the sex life is too violent or too high frequency, stimulating the uterus contraction, pelvic congestion and contraction, easy to make the placenta fall off causing miscarriage; 3, malnutrition: early pregnancy malnutrition, or not enough supplementation of folic acid, can also lead to poor fetal development or even lead to malformation, leading to miscarriage; 4, mood swings 4, mood swings: pregnant women with changes in hormone levels may be more obvious mood swings, while the early pregnancy of the fetal organs have not yet developed, bad emotional stimulation may easily induce miscarriage; 5, overwork: pregnant women overwork, exercise more, may aggravate the pregnancy reaction, hinder the mother to the fetus nutrient supply, fetal stunting easily lead to miscarriage; 6, their own disease: pregnant women luteal insufficiency, thyroid gland low function, severe diabetes, uterine malformation, or systemic infection, high fever, may lead to fetal malformation, stillbirth and other phenomena, which can easily cause miscarriage in early pregnancy. In early pregnancy, you should pay attention to nutrition, eat more fruits and foods with high protein content, avoid eating spicy and stimulating foods, stay away from smoking and alcohol, and take folic acid supplements on time. In early pregnancy, sexual intercourse is forbidden, pay attention to rest, keep a good state of mind, and stay away from radiation and radioactive environment to avoid affecting fetal development. Regular maternity checkups, perfect prenatal chromosomal and other genetic examinations, and take early measures to avoid the birth of affected children.