During that time she will take off six weeks, while deputy PM Winston Peters steps up as acting-PM. "I am not the first woman to work and have a baby", Ardern said in a news conference Friday, as reported by The Washington Post.
The popular and charismatic politician, New Zealand's third female leader, who took office past year after a closely fought election, said she planned to work until the end of her pregnancy in June and then take six-weeks leave.
On the show, Arden said, "I think a lot of women face this dilemma in the workplace no matter what their profession or job might be".
She said the overseas leaders who had sent messages of congratulations to her included British Prime Minister Theresa May and Australian Prime Minister Malcolm Turnbull.
Her partner, Clarke Gayford, is attending the caucus as well.
The popular 37-year-old politician's pregnancy is one of the very few examples of an elected leader holding office while pregnant and the first in New Zealand's history. - Australia's Minister for Revenue and Financial Services Kelly O'Dwyer, who had a baby previous year while serving in cabinet.More news: White House slams Flake: He is looking for attention
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Ardern took over the Labour leadership in July. "I am about to sympathize with them as I sympathize with all women who suffered morning sickness". Advocacy groups say her announcement could help break stigma on the issues of women juggling a career and family. Pakistan's Benazir Bhutto gave birth while she was prime minister in 1990.
The short period contrasts with her party's parental leave policies, with the Labour-led coalition expanding paid parental leave from 18 to 22 weeks in one of its first legislative changes. She is thought to be the first modern head of government to give birth while in office.
In congratulating the pair yesterday and wishing them every joy, Peters said: "Ours is a novel coalition in many respects and the Prime Minister's announcement only reinforces its unique qualities".
The 37-year-old anxious her staff might notice she was eating constantly, and only the same foods.
New Zealand's prime minister is not the first female world leader to give birth while serving.