Child, Youth and Family (CYF) says it had been searching for a toddler in the weeks before he died in an Auckland house yesterday morning but could not locate him.
Police launched a homicide investigation after James Joseph Ruhe Lawrence, 2, died at an Orakei house.
A post-mortem was carried out today but police but have not released details about how James died.
CYF northern region director Grant Bennett said the toddler came to the organisation's notice four weeks ago.
"We consulted with other agencies, visited the home several times and were actively attempting to find mother and child. Despite this we had been unable to speak with his mother or sight James to check on his wellbeing.''