The mother, who was not identified, gave birth to six boys and two girls weighing between 1.8 pounds (820 grams) and 3.4 pounds (1.54kg), doctors at Kaiser Permanante hospital told KCAL9.
"It's a surprise," Dr. Karen Maples said. "Eight newborns are in stable condition and they're doing quite well."
Doctors estimated the woman's delivery lasted only five minutes.
"They were all screaming and kicking around very vigorously," Dr. Harold Henry told the TV station.
The first live-born octuplets were born in Houston in 1998, and one baby died about a week later. The surviving siblings - girls Ebuka, Gorom, Chidi, Chima and Echerem, and their brothers Ikem and Jioke - celebrated their 10th birthday in December.
Their parents, Nkem Chukwu and Iyke Louis Udobi, said they are astonished and grateful that their children have grown up to be healthy and active kids who are now in the fourth grade.
