New Zealand Prime Minister Jacinda Ardern Welcomes Healthy Baby Girl

"Welcome to our village wee one," the New Zealand prime minister wrote.

Jacinda Ardern has given birth to a healthy baby girl.

The New Zealand Prime Minister went into labour early on Thursday morning, giving birth to a baby girl at 4.45 that afternoon.

The baby, whose name is not yet public, weighed 3.31kg.

"Welcome to our village wee one," Ardern wrote on Instagram, posting a photo of herself and husband Clarke Gayford with their new bub.

"Feeling very lucky to have a healthy baby girl that arrived at 4.45pm weighing 3.31kg (7.3lb) Thank you so much for your best wishes and your kindness. We're all doing really well thanks to the wonderful team at Auckland City Hospital."

Gayford posted the same photo to Twitter. "Huge thanks to all involved," he tweeted. "What a team."

It's the couple's first child together, and comes eight months after Ardern, 37, was sworn in as New Zealand's Prime Minister.

She'll become the first ever elected world leader to take maternity leave, handing over the reins to Deputy Prime Minister Winston Peters for six weeks.

However, she'll still be around for major decisions, with Peters calling on her for anything of "significance political, strategic or public interest, or national security" matters.

Arden has spent months downplaying the significance of her maternity leave, telling a local news station: "The thing to keep in mind is: I'm not dead."

Congrats to the happy couple!