Prince Sisowath Thomico, a royal family member who also was Norodom Sihanouk's assistant, said his death was "a great loss to Cambodia," adding that he had dedicated his life "for the sake of his entire nation, country and for the Cambodian people."
Sihanouk's successor, Norodom Sihamoni, is expected to fly to Beijing on Monday to retrieve his father's body, Thomico said.
Cambodian government spokesman Khieu Kanharith said an official funeral will be held once the former King's body is repatriated.
More top news
Ms Ardern posted a photo showing her and Clarke Gayford with the baby at Auckland City Hospital.
Nasa says scientists have found 95% of near-Earth objects measuring a kilometre or bigger, but the remaining 5% could inflict big damage.
There will be showers during the morning across Scotland, but these will clear during the afternoon.