It is safe to eat moderate amount of mung bean during pregnancy.
First, mung bean is rich in iron which can help expecting mothers fight againt anemia as iron can aid in the formation of the red blood cell.
Furthermore, mung bean is rich in dietary fiber which can help to prevent constipation during pregnancy - a discomfort experienced by many pregnant women.
Moreover, mung bean contains folic acid which can help to prevent birth defects in newborns.
However, mung bean is a "cold" food which may cause discomfort in stomach if consumed in excess.
In some cases, mung bean can also exacerate morning sickness experienced by many pregnant women.