Detectives from the Homicide Squad are investigating following the death of a Sebastopol child last week.
Police have been told the one-year-old boy became unresponsive about 12pm on Tuesday, 4 November while at home and was taken to hospital by his mother and her partner.
Sadly, the child passed away in a Melbourne hospital on 6 November.
The exact circumstances leading up to the child's death are still being determined.
Detectives from the Homicide Squad and the Ballarat Child Abuse and Sexual Assault Investigation Team have spoken with the boy's 26-year-old mother and her 18-year-old male partner.
The investigation remains ongoing.
Anyone with information is urged to contact crime Stoppers on 1800 333 000 or submit a confidential report at www.crimestoppers.com.au
