40 women giving birth to children does not necessarily have adverse consequences, some patients will have fetal malformation, high rate of miscarriage, eclampsia and other consequences. 40-year-old woman giving birth to a child belongs to the advanced maternal age, but does not necessarily cause adverse effects on the pregnant woman’s organism, women should pay attention to rest during pregnancy as well as pregnancy diet, avoid staying up all night or overwork, eat less food with high sugar content. However, some 40-year-old women giving birth to children will have fetal malformations, and the probability of genetic defects in advanced maternal age is higher than that of general maternal age. In addition, 40-year-old women giving birth to children will also increase the risk of miscarriage, because the ovarian function of elderly women is gradually declining, which will increase the chances of miscarriage. Some women of advanced age will also develop eclampsia, in which the patient will suffer from high blood pressure, headache, visual impairment and other symptoms. Therefore, 40 women may have no adverse consequences of giving birth to a child, or they may experience a variety of uncomfortable symptoms. It is recommended that pregnant women pay attention to the maternity examination during pregnancy, and if any uncomfortable symptoms occur they should go to the hospital in time and follow the doctor’s instructions.