Passage: Traditionally, marriages were often arranged during the pregnancies of two women. If they gave birth to opposite sex babies, the two babies were supposed to be married if they grew up as friends. It was problematic if a boy or girl came of age and rejected their assigned fiancé(e).  Finding a replacement was difficult because most girls and boys were already engaged. However this custom has been disappearing.  Most Tharus now practice conventional arranged marriages.  They also practice love marriages, inter caste marriage, marriage after courtship and eloping.

Question: When was marriage traditionally arranged?
during the pregnancies of two women