Police are investigating the suspicious death of a baby in the Hunter region.
Just after 3pm on Sunday, a seven-month-old boy was taken to Muswellbrook Hospital in an unresponsive state, police said.
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. The death is being treated as suspicious.