Has Jacinda Ardern blurted out the sex of her baby?

Speculation is mounting after a radio interview this morning which some listeners believe contains a reference to a "her".

Ardern and partner Clark Gayford announced on Friday that she was pregnant with their first child, due in June.

However they had decided to keep the baby's gender to themselves.

In a radio interview this morning, asked how it would work travelling with Diplomatic Protection service officers and a baby in tow, Ardern said: ""I have no doubt I'll be hauling around the country, so it'll be hard to hide."

Or did she say: "I have no doubt I'll be hauling her round the country, so it'll be hard to hide."

Ardern also admitted she and Gayford had a bet as to who would blab the gender secret first.

"I think we've made a mistake in knowing [the sex of the baby], because both of us are taking bets now on who's going to stuff it up," she told More FM.