An autopsy Tuesday on the body of a 4-month-old boy who died in the Imperial Sand Dunes over the Thanksgiving weekend failed to reveal a cause of death.
County Coroner's Sgt. Rick Macken said the investigation is pointing to sudden infant death syndrome.
Macken said laboratory and toxicology tests will be done, but it could be more than a month before those test results are known.
Macken added there are no signs of foul play in the baby's death.
On Saturday the infant's parents, who reside in Temecula, put their child down for a nap in the afternoon inside the family camper.
Four hours later they checked on the boy, and did so again two hours after that. During that check they found their child unresponsive.