The Sacramento Bee reports that Abby, Brin and Laurel Hepner were born Nov. 22 at Sutter Memorial Hospital to Hannah and Tom Hepner, of Quincy.
The triplets were produced when a single, fertilized egg split into three.
Dr. William Gilbert, director of Sutter Women's Services, says the odds of producing identical triplets without fertility drugs range from 1-in-1-million to 1-in-100-million.
He said the rarity makes it difficult to more accurately calculate the frequency of such births.
Abby weighed 3 pounds, 2 ounces; Brin 3 pounds, 11 ounces; and Laurel 4 pounds.
The triplets are still in the hospital until they can maintain body temperature and eat properly.
More Nation & World Headlines
First women to earn Army Ranger tab speak out July was hottest month in hottest year on record Donald Trump keeps boosting TV ratings How did Donald Trump make his fortune? 7 parachutists die, 31 survive as planes collide Josh Duggar calls himself 'hypocrite,' admits cheating on wife Engine concern diverts 767 to Vegas Investigators to recommend Caitlyn Jenner face manslaughter charges in car crash
Our new comment system is not supported in IE 7. Please upgrade your browser here.