Conversation so far:
When did Mumtaz Mahal get married?
Mumtaz Mahal was betrothed to Shah Jahan around 30 January 1607. They were married five years after on 30 April 1612.
How long were Mumtaz Mahal and Shah Jahan married?
nineteen years of marriage
Did Mumtaz Mahal and Shah Jahan have kids following the marriage?
They had fourteen children together, seven of whom died at birth or at a very young age.

Question: Did that make a strain in their marriage the death of their children?
Self-contained rewrite: Did that make a strain in Mumtaz Mahal and Shah Jahan's marriage, the death of their children?