Key points:- Ms Ardern choked back tears saying she did not have the energy to seek re-election- Her final day in office will be February 7- She announced New Zealand's general election will be held on October 14Ms Ardern choked back tears on Thursday as she said she did not have the energy to seek re-election.She said she would be there when her daughter Neve started school next year, and to her partner added: "To Clarke, let's finally get married."After only three months as leader of Labour, she took the party from an unwinnable election position to government.Ms Ardern grew up in the rural town of Morrinsville, on the country's North Island, and went on to live in the UK where she worked as a public servant.In 2018 Ms Ardern gave birth to her first child, Neve, making her only the second elected world leader, after former Pakistan prime minister Benazir Bhutto, in modern history to give birth while being in office."