The test for the second child is similar to that for the first child, but the difference is that if the pregnant woman is Rh-negative, an antibody potency test will be performed to assess the presence of hemolysis in the fetus when she is pregnant with the second child. If hemolysis is present, treatment should be administered according to medical advice. Other common clinical tests include routine checkups, ultrasonography, Down’s syndrome screening, glucose tolerance test, etc.: 1. Routine checkups: early pregnancy requires a full maternity checkup in the community, including routine blood tests, coagulation function, blood type, liver function, infectious diseases, electrocardiogram, etc.; 2. Ultrasonography: early pregnancy requires ultrasonography to determine if the pregnancy is intrauterine. After the intrauterine pregnancy is confirmed, regular maternity checkups will be conducted, such as major teratology ultrasonography, fetal heart ultrasonography and minor teratology checkups, etc.; 3. Down’s syndrome screening: this test includes early and mid-term. At 12 weeks of gestation, NT test is required to measure the thickness of the posterior nuchal translucency to assess whether the fetus may have chromosomal abnormalities or congenital heart disease. At the middle stage, especially for senior pregnant women, tests such as non-invasive DNA or amniocentesis are recommended to determine whether the fetus has chromosomal abnormalities. 4. Glucose tolerance test: At 24-28 weeks of gestation, a glucose tolerance test is performed to observe whether the woman has gestational diabetes. In addition to the above tests, women should also have regular maternity checkups, weekly maternity checkups after 36 weeks, regular ultrasound examinations, fetal heart monitoring, etc.