Jacinda Ardern and daughter to remain in hospital until Sunday

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Prime Minister Jacinda Ardern, partner Clarke Gayford and their newborn baby girl.

Prime Minister Jacinda Ardern and her daughter will remain in hospital for a third night.

Ardern's press secretary Andrew Campbell said the pair was scheduled to leave Auckland City Hospital on Sunday at 11am.

The baby girl, who is as yet unnamed, was born at 4.45pm on Thursday, weighing 3.31kg.

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The Embassy for the Prime Minister of the Kingdom of Saudi Arabia sent flowers to Prime Minister Jacinda Ardern on the arrival of her new baby daughter.

On Friday, a spokesperson said Ardern had had a sleepless first night with her daughter and would remain in hospital for another night.

Usually, new mothers leave Auckland City Hospital soon after birth and head to nearby Birthcare, in Parnell.

JACINDA ARDERN/INSTAGRAM

Ardern's midwife came to the rescue on Friday with macaroni and cheese after a sleepless first night.

However, Campbell said Ardern would remain in hospital on Saturday night as security arrangements made a transfer to Birthcare difficult.

Her mother Laurell was scheduled to visit on Saturday, but her plane from Nelson had been delayed.

The baby was also due to have her first bath on Saturday afternoon.

Campbell said the family was "in really good spirits" and Ardern and her baby were doing well.

Ardern was meeting with her obstetrician, midwife, and phyiotherapist on Saturday morning.

"It was a hive of activity up there," Campbell said.

He described the baby as "super cute".

Ardern had an omelette for dinner on Friday night, and porridge and a cup of tea for breakfast.

She had enjoyed a more restful night on Friday, as the infant had slept for longer, Campbell said.

A bouquet of flowers had been delivered from the Kingdom of Saudi Arabia, but was "so big and fragrant it can't fit in her room".

Campbell said Ardern had shared the flowers with other mothers and families on level 10.

Well-wishes had also been received from Commonwealth secretary-general Patricia Scotland and Japanese Prime Minister Shinzō Abe, Campbell said.