At first blush, it’s remarkable that a man who was exiled to the political wilderness a mere decade ago will soon ascend to the country’s top job.
But this is Winston Peters, of course, and he’s been here before.
On June 17 (or earlier, if the baby has other plans) Prime Minister Jacinda Ardern will begin six weeks’ maternity leave.
She will hand the keys over to her coalition partner Peters, but not without caveats.
It’s understood Ardern will soon release more details about exactly how the relationship between her and the New Zealand First leader will work while she’s away, and what she expects of her deputy.
For anything major she will still be calling the shots and will remain involved in decision making, continuing to receive Cabinet papers for some light reading during her time off.
For people joking about Peters going rogue, rest assured that almost certainly won’t happen.
Most decisions are usually made in consultation with Cabinet, which Labour controls.
Technically Peters has the power to fire ministers or declare a snap election, although the Cabinet Manual declares he should be making decisions in consultation with the actual Prime Minister.
The reality is Peters' time in charge will be business as usual, although the post-Cabinet press conference will likely be slightly spicier.
He is also expected to keep Ardern’s regular Tuesday morning media slots, making his appointment with RNZ’s Guyon Espiner mandatory listening.
But what about the nuts and bolts of how the government machine will work with Winston in charge?
There will be no shift to the ninth floor of the Beehive, with both Peters and his team remaining in their office two floors below.
Staff from Ardern’s office will continue to be the first port of call for media requests, with his existing staff handling enquiries about his current portfolios.
He will continue with his duties in foreign affairs, state-owned enterprises, and racing, while Ardern’s role as Child Poverty and Arts, Culture & Heritage Minister will be assumed by the associate ministers.
In short, New Zealand’s Prime Minister having a baby in office will be historically significant, but Peters time in charge will not.
As Victoria University’s Jim McAloon points out, while Ardern taking six weeks maternity leave is a landmark event, the length of the absence pales in comparison to some of her predecessors.
When Peter Fraser became prime minister in 1940, much of the planet was in the grip of World War II.
During that time he spent significant periods overseas, including a five-month stretch in 1941.
While absent, Walter Nash acted as prime minister and was “grossly overworked”.
By 1948, and after another five-month absence, Nash was “indulging his notorious skill at procrastinating” and a three-day Cabinet meeting was needed to clear all outstanding business.
Things were even more complicated during World War I.
Prime minister William Massey’s deputy, former Liberal prime minister Joseph Ward, insisted on travelling overseas whenever the former did, leaving defence minister James Allen in charge for a total of almost two years between 1915 and 1919.
More recently, McAloon points to Jim Anderton being left in charge during Helen Clark’s overseas trips, while Peters himself had had brief stints in the top job during his run as deputy prime minister in the early 1990s.
During that time, Peters and his prime minister Jim Bolger were able to work out their differences, but when Jenny Shipley took over that all changed.
“Part of how it works, of course, depends on relationships and I don’t see any reason to assume that relationships will be stormy this time or things will be difficult. If the prime minister and deputy prime minister don’t get on, you have a dysfunctional government anyway.”
So things shall be fine and the country will not crumble.
After his stint as prime minister, Peters won’t be referred to by the title, unlike American presidents who retain their title for life.
But while he is in charge everyone had best remember that it’s not just the Rt Hon Winston Peters they’re addressing.
Note: This story has been updated after new information was received.