New Zealand prime minister and her baby make history at the U.N.

Credit: @NZCLARKE/Twitter

A tiny, history-making visitor became a highlight during a meeting at the United Nations General Assembly on Monday, when New Zealand's prime minister brought her baby into the assembly chamber.

Prime Minister Jacinda Ardern's 3-month-old, Neve is now the youngest person to ever attend a session at the U.N.

The mother and infant sat in the front row with the baby's father, Clarke Gayford, for the Nelson Mandela Peace Summit, where Ardern delivered a speech.

Gayford later took to Twitter and posted an image of a special credential pass Neve received that described his daughter as New Zealand's "first baby." 

Gayford tweeted​​​​, "I wish I could have captured the startled look on Japanese delegation inside UN yesterday who walked into a meeting room in the middle of a nappy change."

Ardern, 38, is traveling with Gayford and their daughter for the U.N. General Assembly proceedings this week. 

On Twitter, Gayford joked that Neve had kept them awake until 3:45 a.m., without any regard to the changing time zones.

Ardern is the youngest prime minister New Zealand has ever had and only the second elected woman.

With the arrival of Neve, Ardern also became the first world leader in almost 30 years to have a child while in office.

Pakistan's prime minister Benazir Bhutto was the first when her daughter was born in 1990.