Abortion in the 4th month of pregnancy can be harmful because it is not possible to apply abortion in the 4th month of pregnancy and the only way to expel the embryonic tissue is through induction of labor, which is more painful. In the 4th month of pregnancy the fetus is already formed, there is skeleton formation and the limbs, trunk and head of the fetus can be clearly seen. It is necessary to terminate the pregnancy by inducing contractions of the uterus by artificial means to protect the woman from further damage. Induction of labor is usually done by hydrocolloid induction, Levanox induction, and indocin induction, all of which are used to soften the cervix and then expel the embryonic tissue by inducing uterine contractions. The pain is similar to contraction pain, and the embryo and placenta can be expelled only after the opening of the uterus is gradually opened. Moreover, if the embryonic tissue is not completely expelled after induction of labor, the residue in the uterine cavity may cause uterine infection, uterine adhesions, hemorrhage and other adverse consequences, which require timely treatment with uterine removal surgery, so it also has a great impact on the physical and mental health of women. If the fetus has not developed abnormally in the fourth month of pregnancy, try to keep the child, because in this period the embryo has taken shape, and then abort the child is more cruel, and the damage to the woman’s body is greater. If a woman does not have a pregnancy plan and does not want to have a child, she should try to have an abortion within 40-60 days, which will cause less harm to her body.