New Zealand Prime Minister Jacinda Ardern gave birth to her first child, a girl, on Thursday, Ardern said in a posting on Instagram.

Ardern, 37, became New Zealand's youngest prime minister when she took office through a coalition deal last year after an inconclusive election, and now becomes the first woman in the country's history to give birth while in office.

Deputy Prime Minister Winston Peters has stepped in as acting prime minister and will run the country for the next six weeks while Ardern takes maternity leave, according to an agreement they published earlier.