Just after 3pm yesterday (Sunday May 17), a seven-month-old boy was taken to Muswellbrook Hospital in an unresponsive state.

Despite the efforts of hospital staff, the baby was unable to be revived.

Officers from Hunter Valley Police District were notified and commenced an investigation.

A crime scene was established at a home in the Hunter region and examined by specialist forensic officers.

A post-mortem examination will be conducted to establish the cause of death; however, it is being treated as suspicious.

No further information is available at this time.