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Jacinda Ardern is holding a media conference following her pregnancy announcement.
The Prime Minister said she was expecting her first child in June and partner Clarke Gayford will stay home as the primary caregiver.
"We're both really happy. We wanted a family, but weren't sure it would happen for us, which has made this news unexpected but exciting.
"Yesterday, I met with Deputy Prime Minister Winston Peters to share the news and to ask him to take on the role of Acting Prime Minister for a period of six weeks after our baby is born."
Ms Ardern found out about her pregnancy on October 13, just six days before finding out she would be Prime Minister.
