When the amniotic index (AFI) decreased below 50 mm, the risk of cesarean section within 48 hours increased 6.29 times (OR= 6.29, 95% CI: 2.41 - 16.29) and the risk of neonatal death increased 4.89 times (OR= 4.89, 95% CI: 1.69 - 14.11) compared with the group of pregnant women with normal amniotic fluid index.