A man has been arrested after investigations into the death of a seven-month-old baby.
Police have told AAP the 36-year-old was taken into custody after a vehicle stop on the New England Highway at Muswellbrook just after 6:30pm yesterday, Wednesday 20th May.
The man was taken to Muswellbrook Police Station, but no charges have been laid yet.
Police had first set up an operation at Nundle near Tamworth, but ended up arresting the man at Muswellbrook.
The man's arrest comes as police investigate the death of a seven-month-old boy that was taken to Muswellbrook Hospital unresponsive on Sunday afternoon and tragically couldn't be saved.
Hunter Valley Police District officers set up a crime scene at an Aberdeen home and the baby's mother and family have been cooperating with investigations.
They have also been speaking to people who had contact with the baby in the days and hours leading up to his death.