An amniotic fluid index of 2.9cm usually necessitates an immediate cesarean section. Otherwise, it will threaten the life of the fetus. Normal amniotic fluid index will usually be 8cm to 25cm, if the amniotic fluid index is less than 5cm, then it may lead to intrauterine hypoxia of the fetus. Therefore, cesarean section needs to be performed according to the doctor’s instruction. If it is delayed, then it may affect the life of the fetus and may lead to obstructed labor. If the amount of amniotic fluid is too low, then it is not possible to have a normal delivery, which may lead to fetal ischemia and hypoxia, and may also lead to obstructed labor or hemorrhage. Not only will the life of the fetus be jeopardized, but the life of the pregnant woman will also be threatened. During pregnancy, it is recommended to go to the hospital on time for checkups. If there is too much or too little amniotic fluid, it may affect the development of the fetus. If the amniotic fluid during pregnancy is low and the normal index is not much different, you can usually follow the doctor’s advice to drink more water, and then have a checkup to observe the condition of the fetus.