Jacinda Ardern, the Prime Minister of New Zealand, has given birth to a girl. Her first child was born weighing 7lb 3oz at Auckland City Hospital on Thursday.

The 37-year-old has become only the second elected world leader to give birth while in office.

"I'm sure we're going through all of the emotions new parents go through, but at the same time feeling so grateful for all the kindness and best wishes from so many people. Thank you," Ms Ardern said in a statement.

She added that both mother and daughter are doing well, as she praised medical staff.

Posting a picture on Instagram with her partner Clarke Gayford, 40, and their new baby in hospital, Ms Ardern said she was "feeling very lucky".