An amniotic fluid index below 80mm is considered low amniotic fluid and requires drinking water, observation and if it decreases further, termination of pregnancy needs to be considered. If the amniotic fluid index is less than 80mm, the amount of amniotic fluid can be increased by drinking water under the guidance of a specialist. Hyponatremia can also be considered to be prevented as well as treated by amniotic fluid infusion in the middle and late stages of pregnancy. If these conditions cannot be relieved, and fetal malformations are ruled out, it is necessary to consider termination of pregnancy to prevent fetal hypoxia from occurring. The amniotic fluid index is an important indicator during pregnancy, so women need to be actively monitored and any abnormalities need to be treated.