Brisbane baby death treated as suspicious, mother questioned by police We’re sorry, this service is currently unavailable. Please try again later. Dismiss Brisbane baby death treated as suspicious, mother questioned by police Normal text size Advertisement The death of a five-month-old girl at her family's unit in Brisbane's south last month is being treated by police as suspicious after a post-mortem revealed it was "not a natural death". The baby's 32-year-old mother was questioned by detectives on Sunday, but no charges have been laid. However, police say she is their only person of interest at this point in time.