(CNN) - Newborn twins in California have different birthdays, in different years. One was born on December 31, 2017, the other on January 1, 2018.
Maria Espernza Flores Rios was originally due on January 27, then had a c-section scheduled for January 10.
However, at 11:58 p.m. on December 31, just two minutes before the new year, Joaquin Ontiveros was born, weighing in at 5 pounds, 9 ounces, 18 inches long.
Doctors said his twin sister, Aitana De Jesus, was slightly breached and had to be delivered via c-section. She was born at 12:16 a.m., 18 minutes after her brother, but technically in the next year. She weighed in at 4 pounds, 10 ounces and 16 inches long.
"I feel really happy because I just had my two babies," the new mother said.