Delano Regional Medical Center told reporters than a brother and sister were born in 2017 and 2018 respectively.
The first twin was born at 11:58 p.m. Sunday. The second twin, a baby girl named Aitana, was born at 12:16 on Monday morning.
The hospital awards the first baby born each year with gifts from donations.
The new parents said their New Year's babies were born about a month early after being originally due on January 27 but they had a C-section scheduled for January 10, KERO reported. While siblings in such cases are usually born together, can one of them be delivered in a different year altogether?
Her original due date was January 17, with a c-section scheduled for Jan 10. The twins will receive $3,000 worth of baby supplies, said Matthew Cauthron, director at the medical center.
Maria Flores' twins were born less than 20 minutes apart. "When they realized they were going to be in the hospital over New Year's Eve, the family planned to celebrate at midnight in the break room".
Play Video - 1:26 Twins Born In Different Years! "But then it turned out Maria was in labour, which was a surprise".
It's rare for twins to be born in different years, with Dr. Seyed Tamijidi, who delivered the twins, saying he'd never before seen it happen in his 35-years of practice.