Hutt Valley police continue to examine a Taitā property after the death of a toddler at the weekend.
The boy, who would have turned two today, Wednesday, was taken to Hutt Hospital about 12.30pm on Sunday in an unresponsive state and died soon after.
Detective Inspector Nick Pritchard of Wellington District CIB said the toddler's death remained unexplained.
Police were hoping to clarify how the child died to give the baby's whānau some answers.
"The investigation team has been working hard to determine exactly what happened and, as part of that process, staff are speaking to the family of the child who are assisting with our enquiries.
"This is a terribly sad and tragic situation so it is important we are thorough in our investigation, and consider all possibilities that could have led to the death.
"Our thoughts are with the whānau of the deceased at this difficult time."