Usually, we regard women over the age of 35 as elderly women, and the risk of pregnancy at an advanced age is much greater than that of young mothers. So what are the risks? 1, the risk of miscarriage increases. About 15% of pregnant women in their early 30 s will suffer from abortion; For 40-year-old pregnant women, 25% will encounter this situation; After the age of 45, half of pregnant women are at risk of miscarriage. 2. The increase of other diseases. The harm of elderly women is that the incidence of complications after pregnancy will increase, such as pregnancy-induced hypertension and gestational diabetes, and the incidence of premature delivery and low birth weight will also increase. 3. Congenital abnormal increase of fetus. Take the congenital idiot as an example, this deformity is because the child's chromosome 2 1 is invalid, one more than the normal child. 90% of this chromosome problem is caused by mistakes in the division of the mother's egg cells, and the incidence of such mistakes is directly related to the mother's age. When the female is 2 1 year-old, the proportion of children with congenital idiocy is 1: 1667, reaching 1: 375 at the age of 35, and even reaching 1: 30 at the age of 45. The incidence of other congenital diseases, such as congenital cardiovascular malformation and cleft lip, has also increased significantly. 4. The risk of childbirth increases. Due to age, the joints of birth canal, perineum and pelvis are difficult to expand, and the contractility of uterus and the tension of vagina are poor, which prolongs the delivery time and is prone to dystocia. Therefore, if women over the age of 35 want to get pregnant, it is suggested to intervene in advance before pregnancy, pay attention to increasing nutrition and strengthening physical fitness at ordinary times, pay special attention to prenatal examination during pregnancy, and make prenatal diagnosis when necessary. On the basis of routine pre-pregnancy eugenics health examination, it is suggested that women over 35 years old should add pre-pregnancy examination items: female sex hormone determination and AMH determination (to evaluate ovarian function), cervical TCT examination (to exclude cervical precancerous lesions) and B-ultrasound monitoring ovulation.