Through multiple prenatal checkups, the health status of both mother and child can be evaluated, lethal malformations (anencephaly, severe open spina bifida, single atrium, single ventricle, lethal dwarf, severe cerebrospinal membrane bulge, severe thoracoabdominal wall defect, visceral ectopia, etc.) can be detected and eliminated, and the mother can be found to have no pregnancy complications (diseases that existed before pregnancy or were discovered during pregnancy) or complications (diseases caused by pregnancy). In addition, it is important to check whether the mother has any other congenital anomalies (such as Down’s syndrome, congenital heart disease, etc.) and to treat them accordingly, so that the mother and child can pass through pregnancy, delivery and puerperium smoothly and the baby can grow up healthily and have a good birth. Therefore, prenatal checkups are necessary and start with early pregnancy confirmation.