GETTY IMAGES/PHIL WALTER

Prime Minister Jacinda Ardern will take six weeks off work after the baby arrives (file).

A day after her expected baby due date, Prime Minister Jacinda Ardern was working on cabinet papers, reading letters from children and visiting her electorate office.

The prime minister posted a photo on Instagram on Monday of herself with staff members Therese and Barbara, at her electorate office in the Auckland suburb of Mt Albert.

Ardern became the MP for Mt Albert in 2017.

On Instagram, Ardern wrote: "No more flying means teleconferences, a lot of phone calls, and a Monday visit to the electorate office to catch up on a few bits and pieces."

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"If you haven't met them before, this is Therese and Barbara and they are exceptional human beings.

"I feel very lucky to have them in our Mt Albert office!"

Ardern's baby was due on June 17 and, when the time comes, she is expected to give birth at Auckland Hospital, with partner Clarke Gayford by her side.

Last Tuesday, Ardern told The AM Show she may induce labour if the baby does not arrive soon.

The prime minister will take six weeks leave after giving birth.

During that time deputy prime minister Winston Peters will become acting prime minister.

On Sunday, Peters took over Ardern's Wellington duties but currently remains deputy prime minister, with Ardern is still signing documents, making phone calls and running the country.

 - Stuff