She points out that Ardern has pointed all naysayers wrong and, alongside stay-at-home dad Gayford, she is redefining the family stereotype and showing that maybe women can have it all.
She added: 'We're all doing really well thanks to the wonderful team at Auckland City Hospital'.
In less than 20 minutes, her Instagram post received more than 24,000 likes.
The former prime minister said attitudes had changed since she'd entered politics and that was a good thing. Their daughter is very much a wanted child for these happy parents. She and Gayford had "been clear we wanted to be parents but had been told we would need help for that to happen". "My full congratulations go to both Jacinda and Clarke, and I wish them and their new baby all the best", Clark said.
"Like the rest of the country we welcome the news of the birth of a healthy baby and are naturally delighted for the new parents".
"I'm just pregnant, not incapacitated", she said recently.
But for the public in New Zealand and beyond, the new arrival in our country's first family also has considerable significance.
However, the Prime Minister will still be consulted on all major decisions.
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Speaking to reporters, Grisham echoed those sentiments but emphasized that the first lady believes all immigration to the USA should be done legally.
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The White House also agreed with Sessions and Sarah Huckabee-Sanders said during a press briefing that "it is very Biblical to enforce the law".
Ardern's partner Clarke Gayford, 40, was a fishing series TV host and would nanny the new-born according to their previous plan.
Ms Ardern will now take six weeks off on maternity leave, with Deputy Prime Minister Winston Peters to take over as Acting Prime Minister in the interim. Asked by reporters if she had made a choice, Ardern said the process was going "terribly", per The New York Times.
Ardern's due date was June 17.
"Welcome to our village wee one", Ms Ardern wrote on Instagram.
And, despite not holding political office, Queen Elizabeth II of course welcomed all four of her children during her reign.
Meanwhile, good wishes have flooded in from around the world.
The birth capped an eventful year for Ardern who became prime minister last October, three months after inheriting the leadership of the Labour Party when it was languishing in the polls.