With the new policy of the second child in effect around the world, many mothers and fathers began to “add another baby” to the family. Many pregnant women with second children feel that they have already had experience and that they can be less concerned about the second child’s birth. The truth is that women who are pregnant with their second child are older than their first child, and some are even at high risk of maternity, so some indicators should be paid more attention to during the maternity checkup. The woman is suitable for the birth of two children is mainly subject to two factors, one is the physical condition, if the woman suffers from serious chronic diseases, poor health conditions, temporarily unsuitable for re-birth. The second is to consider the age factor. Generally, the medical definition of 35 years old and above is advanced age, and the risk of chromosomal abnormalities in the fetus and the risk of complications during pregnancy increases when women of advanced age become pregnant. Mothers have similar questions, is it necessary to have a comprehensive preconception checkup before they want to have a second child? Obstetricians and gynecologists remind that preconception checkups for second children are essential for single families planning to have two children! Preconception checkups are physical examinations that couples preparing to have children undergo before they become pregnant. Performing the necessary preconception checkups can guarantee a smooth conception and a safe pregnancy. Generally speaking, preconception health checkups for women mainly include the following. 1.Blood routine (blood group): Early detection of blood body diseases such as anemia, because if the mother is anemic, not only will there be complications such as postpartum bleeding and puerperal infection, but also the baby, which will bring a series of effects to the baby, such as susceptibility to infection, decreased resistance, and backward growth and development. 2.Urinary routine: it helps to diagnose kidney diseases in the early stage. Ten months of pregnancy is a great test for the mother’s kidney system, the body’s metabolism increases, which will increase the burden on the kidneys. If the kidneys have disorders, the consequences will be very serious. 3.Fecal routine: diagnosis of chemical system diseases and parasitic infections, such as toxoplasma infection, which can cause serious consequences such as miscarriage and fetal malformation if not detected early. 4.Liver function (two pairs of half): diagnosis of various types of hepatitis and liver damage. If the mother is a viral hepatitis patient and not detected in time, pregnancy can result in very serious consequences, premature delivery and even death of the newborn. Hepatitis virus can also be transmitted vertically to the child. 5.Gynecological endocrine: including 6 items such as follicle prohormone and luteinizing survival hormone. Diagnosis of ovarian diseases such as irregular menstruation, for example, women suffering from ovarian tumor, even if the tumor is benign, after pregnancy often affects the observation of the tumor because of the enlargement of the uterus, and even leads to miscarriage, premature birth and other dangers. 6, white belt routine: through the white belt routine screening trichomonas, mycobacteria, mycoplasma chlamydia infection, vaginal inflammation, as well as gonorrhea, syphilis and other sexually transmitted diseases. If suffering from sexually transmitted diseases, it is best to treat them thoroughly before getting pregnant. Otherwise, it will cause miscarriage, premature birth, premature rupture of fetal membranes and other dangers. 7.Cervical scraping test: Stories of cervical cancer found only when pregnant are heard from time to time, so a simple cervical scraping test can make mothers-to-be feel more at ease when they are pregnant, after all, a good uterus can give birth to a healthy fetus. 8.Chromosome test: early detection of genetic diseases such as Crohn’s syndrome, Turner’s syndrome and infertility. 9, pay attention to the monitoring of blood pressure, blood glucose: with age, the degree of vascular endothelial damage progressively aggravated, the incidence of severe preeclampsia, placenta praevia, placenta abruptio, premature rupture of membranes and postpartum hemorrhage and other complications of pregnancy in women who are pregnant is significantly higher than in primiparous women, which can lead to an increase in the incidence of hypertensive disorders during pregnancy, so before pregnancy, attention should be paid to the monitoring of blood pressure, blood glucose, if there are abnormalities, should be treated early. It is best to wait for the condition to stabilize before pregnancy. 10. Check for pelvic inflammatory disease: In addition, most women who have had abortions, induced abortions, and IUDs prior to pregnancy are prone to endometritis, which can lead to placenta praevia and placental implantation. During the examination, it is necessary to provide a valid medical history, such as the presence of complications in the previous pregnancy (hypertension, diabetes, thyroid disease, etc.), the mode of delivery (cesarean section or natural delivery), whether the delivery process was smooth, whether there was damage to the soft birth canal, etc. 11, blood type examination can not be ignored: maternal and infant blood type incompatibility neonatal hemolytic disease is most commonly seen in women who have given birth or have a history of miscarriage, this is due to maternal and infant blood type incompatibility resulting in fetal or neonatal immune hemolytic disease, clinical mainly divided into ABO blood type incompatibility and Rh blood type incompatibility. This is due to a history of maternal and infant blood group incompatibility, which can lead to miscarriage, fetal edema, and in severe cases, fetal death in the womb, but these can be monitored early and can be treated. Pregnant women should not undergo medical checkups: ① Women should not receive X-rays during the period before pregnancy. This is because medical X-rays can kill germ cells in the human body. Therefore, to avoid the effect of X-rays on the next generation, it is safer for women who receive X-rays, especially abdominal X-rays, to get pregnant after 3 months. If your monthly period is later than scheduled and you suspect that you are “pregnant” and an x-ray is necessary, it is important to tell your doctor that you may be pregnant and that you are planning to become pregnant. The doctor will tell the pregnant woman if she can have an X-ray. If an x-ray is necessary, the abdomen should also be shielded. The carbon-14 breath test is currently a good method for screening for Helicobacter pylori (Hp for short). It has been in clinical use for more than a decade. However, pregnant and lactating women are not suitable for this test.