"Obviously, I take very seriously the role of becoming a mum, as does Clarke becoming a dad, but we equally take seriously the role I've taken on as prime minister of New Zealand".
Ardern said she did not think her position was that different to others'.
Prime Minister Jacinda Ardern and her partner Clarke Gayford speak to the media January 19, 2018 in Auckland, New Zealand.
Gayford was away filming a fishing show and, surprised she was back in touch after they had just spoken, was told the exciting news via the video function on Facebook.
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"I am not the first woman to work and have a baby", the PM said during the press conference, reports NBC News.
He said: "Congratulations @jacindaardern on your wonderful news today".
As a staunch feminist, one of the ideas she has always championed is a woman's right to not disclose her pregnancy or her family planning to her employers - stating that it is a private matter and that women should not be judged on the basis of that.
Annette King, a former top Labor Party official herself, said Ardern's pregnancy is "good for women...great for politics...and...also 'good for New Zealand because once again here we are showing that you can do things differently in a country like ours'". Ardern said she was surprised her comments were picked up overseas.
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Ardern took over the Labour leadership in July. I know these are special circumstances but there will be many women who will have done this well before I have. Ardern, who identifies as a feminist, went on to explain that she'll be wearing "two hats" after she has her child, serving as both "Prime Minister AND a mum".
"It's our family members who often don't get to interact with everyone else, so it's a really nice opportunity to bring everyone together", she said. She took two weeks' maternity leave to give birth later in the same year, as she worked toward turning around the struggling company. Former Pakistan Prime Minister Benazir Bhutto became the first elected female leader to give birth to a child in 1990.
Ardern's announcement is rare for world leaders.
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The new governor called for the wealthy to pay higher taxes, more funding for Planned Parenthood and a $15 minimum wage . She was serving as acting governor at the time because Christie was out of the state.