Police are investigating the "unexplained" death of a 9-month-old baby in Napier overnight.

Emergency services were alerted at 3.45am but a short time later it was confirmed the baby had died, a police spokeswoman said.

The death was being treated as unexplained, she said.

Police were investigating, including talking with the occupants of the home.

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She did not have any other details, including the baby's sex and how many people were in the house overnight.