INTERNATIONAL: Despite being born just 15 minutes apart, twins Aylin, pronounced EYE-leen and Alfredo Trujillo have completely different birthdays, with each baby arriving in the world on a different day, month and year.

At 11.45pm on New Year's Eve 2021, Fatima Madrigal gave birth to her son Alfredo Antonio Trujillo in Salinas, California. Fifteen minutes later, as the clock struck midnight and hospital staff rang in the new year, Aylin has arrived.

"I thought they were going to be born in the same year. I did not know they were going to be born in a different year. It was a surprise," Madrigal, 28, has said.

The twins have arrived ahead of Madrigal's due date of January 16. Aylin weighed in at 5 pounds, 14 ounces, while big brother Alfredo weighed 6 pounds, 1 ounce.

Madrigal has mentioned her partner Robert Trujillo and other three children, aged 11, 3 and 1, were over the moon with the new arrivals. For now, the twins will celebrate their birthdays on the same day, Madrigal has said.

"I'll explain it to them the best I can, but when they're older, if they want to, you know, celebrate their birthdays, like, different years, it's up to them, but right now that they're small and they're with me, they're going to celebrate their birthday together."

According to Natividad Medical Center, where the twins were born, there are about 120,000 twin births in the U.S. every year, but twins with different birthdays are rare. Some estimate the chance of twins being born in different years as one in 2 million, the hospital said.

^{PHOTO: INTERVIEW WITH FATIMA MADRIGAL, WHO GAVE BIRTH TO TWINS ON DECEMBER 31, 2021 AND JANUARY 1, 2022, MADRIGAL AT HOME WITH TWINS, STILL PHOTOGRAPHS OF MADRIGAL AND TWINS AT HOSPITAL}