Network mapping With the liberalization of the two-child policy, older pregnant women are gradually increasing. Pregnant women over the age of 35 are often asked when doing prenatal examination: amniocentesis or noninvasive DNA examination can be done. Which do you want to do? At this time, pregnant women are often confused. What is the role of noninvasive DNA examination and amniotic fluid puncture examination and how to choose them? The number of obstetric clinics is huge. Doctors can’t spe...