Although she is in a privileged position, being New Zealand's top politician and having a caring and supportive partner, Ms Ardern will be an example to women and employers alike.
In 1990, Benazir Bhutto gave birth to a daughter while serving as Pakistan's prime minister, in what was reported to be a first for an elected world leader. Here, a look back at all the times a woman gave birth while leading a country. "I'll be PM & a mum while Clarke (Gayford) will be "the first man of fishing" & stay at home dad", she wrote on the micro-blogging site.
"It is a woman's decision about when they choose to have children and it should not predetermine whether or not they are given a job or have job opportunities", she said.
Green Party co-leader James Shaw said Ardern's announcement was significant for many women.
"Not that we can blame the many women who feel like they can't have a similarly demanding job and be devoted mothers, given women are still navigating a system that assumes women will be the primary caretakers of children and does so very little to help them juggle their professional and personal lives".
Ardern's maternity leave is particularly short compared to New Zealand law, where women are entitled to 22 weeks of paid parental leave after giving birth.
India vs South Africa: Top 5 Worst Performers for India
The lack of inspiration in the side was quite vivid and that also played a big part in the surrender of the Indian side. Sir Donald Bradman tops the list with 961 points followed by current Australian skipper Steven Smith at 947.
Australian Prime Minister Malcolm Turnbull offered his congratulations on the "wonderful news". Of course, some people, including Mark Richardson of the AM Show quizzed Arden on her plans of starting a family, claiming it was "totally unacceptable" that a female Prime Minister could potentially take maternity leave while in office. When we spoke this morning you sounded more excited than you did when you won the election!
Ms Ardern said she and her partner were both happy about the news.
New Zealand's Prime Minister had a surprise announcement for her electorate earlier today: she's pregnant.
I say give her a chance. "I know these are special circumstances, but they are many women who would have done this well before I have".
The 37-year-old Labour leader took the helm as Prime Minister in October, ending nearly a decade of centre-right National Party rule.
There is an important point to note in her commitment to return to all prime ministerial duties, one which is playing out in rumour and gossip throughout New Zealand. I acknowledge those women.
"Wow, I like the idea that we are doing everything in reverse", he told reporters.