Malachi Gardner of New Bern died about 6:30 a.m. at Children's Hospital, according to the San Diego County Medical Examiner's Office.
Gardner was pulled by a neighbor from a pool at 10215 Winecreek Court around 7:30 p.m. Saturday and rushed to the hospital, according to the Rancho Santa Fe Fire Protection District.
"Incidents like this are difficult for all involved," said Deputy Chief Tony Michel of the district. "Practicing water safety, especially when children are around, is extremely important. Securing pool areas and providing adult supervision are essential to prevent pool accidents."
Authorities said Gardner, who had been babysat by his grandmother for several days, fell into the deep end of the pool. A sheriff's deputy and paramedics both performed CPR on the child before he was taken to the hospital.