PARIS - New Zealand Prime Minister Jacinda Ardern joked Tuesday that sore feet and being "a little slow going upstairs" were her only worries as she began a European tour while seven months pregnant. Ardern, 37, became prime minister last October after a whirlwind rise and then surprised the nation again in January by announcing she was set to become a mum for the first time. Since then, the Pacific nation has been fascinated by the arrival of the baby while the PM has emerged as a role model for working mothers. "The early stages were probably the most difficult because I had such bad morning sickness and at that point no one even knew," Ardern said in Paris. The Labour Party leader was visiting France during a week of meetings that will see her travel to Berlin and then London, where she will attend a Commonwealth Summit on Thursday and Friday. "It hasn't changed my approach to my work. I'm a little slow going up stairs but I'd say that's about the end of it," she said. But a day of meetings about trade and security at the French presidential palace with leader Emmanuel Macron and a speech at Sciences Po university had also taken its toll. "There's no doubt my feet hurt a bit more, but it's not impacting on my ability to do the job," she smiled after apologizing for wearing socks but no shoes during an interview. Ardern's baby is due in June when she plans to take maternity leave for six weeks. She will not be the first woman to give birth while leading a country. Late Pakistani prime minister Benazir Bhutto had a child during her time in office in 1990. - AFP