Royals and world leaders gathered at London's Westminster Abbey on Monday morning to bid farewell to Britain's Queen Elizabeth II.
Ardern, who was sworn in to office in October, said in a Facebook post that she and her partner, Clarke Gayford, are expecting in June.
Games are well-captured and here we document all the action from Day 10, in pictures...
This makes her only the second world leader to have a child while in office.
On Monday (September 24), New Zealand Prime Minister Jacinda Ardern made history as the first female world leader to attend the United Nations General Assembly meeting in New York with her newborn baby in tow. However, Ardern isn't the first to bring their kids to work. Here are some examples of kids roaming the halls of power.