The death of an eight-week-old boy north of Adelaide on Thursday is "unlikely" to have been caused by the Optus triple-0 failure, South Australian police have said.

The baby is among four people in WA and SA — including a 68-year-old woman in the Adelaide suburb of Queenstown — whose deaths had been linked to the Optus outage, which caused hundreds of emergency calls to fail.

SA Police said the investigation into the Queenstown woman's death was "complex" and that they were "continuing to determine the impact" of the outage.

But police said preliminary investigations had found that while the boy's family was impacted, his death was "not due to any delay" in ambulances reaching the Gawler West home.

"The deceased boy's grandmother has told investigating police that she attempted to call

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