Police are at the scene of a sudden death in council housing in the Wellington suburb of Newtown.
Emergency services were called to the Newtown Park Apartments - which are owned by Wellington City Council - just before midday on Tuesday.
Stuff reported nearby residents said they had been told it was a baby that had died, and police were speaking to people.
In response, Oranga Tamariki said it was a police-led investigation so directed all media enquiries to them.
Wellington City Council had the same response, saying it would provide police with CCTV footage if requested.
"This is a police matter, and we, along with the landlord Te Toi Mahana, will assist them with their enquiries regarding this tragic incident. Our thoughts are with the whānau during this difficult time."
In a statement, landlord Te Toi Mahana said: "Our thoughts are with the whānau and community during this very difficult time. Along with the Wellington City Council we are assisting the authorities with their enquiries."
Police said no more information was available at this stage.