Almost every pregnant woman is asked to measure the AFI index - amniotic fluid index - when going for a prenatal check-up to monitor the amount of amniotic fluid, to prevent cases of insufficient or excess amniotic fluid during pregnancy. In particular, the condition of excess amniotic fluid at 31 weeks of pregnancy or excess amniotic fluid at 32 weeks, excess amniotic fluid at 35 weeks all have more or less impact on the fetus and mother.