At 37 weeks and 5 days of pregnancy, the amniotic fluid index is 79mm, which belongs to the situation of slightly low, if the later recovery will not need cesarean section, if the amniotic fluid continues to decrease there will be a fetal intrauterine distress and so on, you need a cesarean section. At 37 weeks of pregnancy, the normal range of amniotic fluid index is 80~180mm, if the amniotic fluid index is 79mm at this time, it is still at a slightly low level, if the fetal movement is good, the fetal heart rate monitoring is reactive, if the amniotic fluid is restored to the normal level in the late stage, the fetal head and the pelvis are in line with the conditions of production, there is no need to carry out a cesarean section, if the amniotic fluid continues to decrease or there is an acute hypoxia of the fetus, then a cesarean section is needed. When the situation of low amniotic fluid occurs at 37 weeks and 5 days of pregnancy, you need to go to the hospital in time, and take reasonable methods of intervention under the guidance of the doctor to promote the healthy birth of the baby.