New Zealand Prime Minister Jacinda Ardern has become the second leader to give birth while in office, in another milestone for women in politics.

The 37-year-old who delivered her new baby girl at Auckland City Hospital on June 21, took to Instagram to reveal the birth of her daughter Thursday, but has downplayed the significance of her pregnancy.

“Plenty of women have multitasked before me, and I want to acknowledge that,” she said in January.

Here are some of the other historic moments for women in government.