An urgent search is under way in South Australia for a missing baby after the child's mother and a toddler were found dead near Port MacDonnell, a coastal town in the state's south-east. Authorities have mobilised emergency services to comb the area, treating the case as a matter of extreme urgency given the infant remains unaccounted for.

Few details have been confirmed publicly, including the circumstances that led to the mother and toddler's deaths or the age of the missing baby. Police and search teams continue to focus efforts around Port MacDonnell as the operation develops.