During pregnancy, if there is a reduction in amniotic fluid, it is easy for premature delivery to occur. Insufficient amniotic fluid can cause fetal hypoxia in the uterus, which may lead to frequent fetal movements and stimulate uterine contractions, resulting in premature birth. When there is a reduction in amniotic fluid, it is important to replenish it in a timely manner. This can be done by drinking more water, intravenous fluid infusion, or directly injecting saline into the amniotic cavity. To determine the best method to replenish the amniotic fluid, it is advisable to seek treatment under the guidance of a doctor and to closely monitor changes in fetal heart rate and movements.