Tests done at 18 weeks of pregnancy include: Down’s syndrome screening, ultrasound for macrosomia, blood test, urine test, listening to fetal heartbeat, blood pressure, weight, uterine height, abdominal circumference, and so on. Down’s syndrome screening is performed at 18 weeks of gestation to assess the risk of fetal neural tube malformation, trisomy 18, and trisomy 13. Pregnant women ≥35 years of age are not screened for Down’s syndrome and need to undergo non-invasive DNA testing. If there are problems with the results of the Down’s test, further non-invasive DNA testing or direct amniocentesis is required. At 18 weeks of pregnancy, pregnant women should also undergo an ultrasound for major abnormalities. In addition, routine maternal checkups include routine blood and urine tests, and each pregnant woman should also have her blood pressure, weight, uterine height, abdominal circumference, and fetal heartbeat measured, so that the basic conditions of the pregnant woman and the fetus can be evaluated to determine whether the growth and development of the fetus is within the normal range. During pregnancy, it is important to go to the hospital for regular checkups to observe the growth and development of the fetus. Pregnant women should pay attention to rest and eat well; if they feel uncomfortable, they should go to the hospital at any time.