In a statement on Wednesday evening, Dee McManus-Emery, the deputy chief executive services for children and families at Oranga Tamariki, said: "We are devastated at the passing of this young boy."
He was in the care of Oranga Tamariki, living with approved caregivers, McManus-Emery confirmed.
"For privacy reasons and while police continue to make inquiries, we cannot provide further detail at this time.