A postmortem found low levels of methamphetamine in his blood but not his liver and it was ruled this did not contribute significantly to his death.
A scene examination was conducted and found the bedroom had a wall mounted heater turned on at a maximum setting.
The Coroner's report stated matters of deep concern were that the mother had been smoking methamphetamine during pregnancy, the father was smoking methamphetamine in the house the night the baby was put to bed and that two parents were sleeping in the bed with two young children.
"The death of Baby X in the circumstances explained is clearly a tragedy. It was unnecessary and preventable.
"It is disturbing to learn from the mother of Baby X that she was not aware of a number of safety factors that could have been applied to prevent this death, which in the Court's view is more likely than not, to be a result of unsafe sleeping arrangements," the Coroner stated.
Dr Bain recommended education be increased in respect of the benefits for safe sleeping environments for babies using the Whakahura and Pepe Pod infant beds.