ANTIOCH -- Two healthy babies born at separate hospitals at the stroke of midnight were the first in the East Bay in 2013, hospital officials said Tuesday.

A baby boy, delivered by his great-grandmother, was born at Sutter Delta Medical Center on Lone Tree Way in Antioch, said hospital spokeswoman Angela Lombardi.

The boy, named Harley Daniel Sparks, weighed 8 pounds, 2.5 ounces at birth and was 21 inches long.

His mother, Kara Jeter, of Bakersfield, went into labor about 2 p.m. New Year's Eve, Lombardi said.

She was due to deliver the boy Jan. 4.

"I would have never thought it would have happened like this," Jeter, 20, said Tuesday morning. "I came up here because it was getting close to my due date. It's pretty amazing."

Jeter's grandmother, 53-year-old Dr. Debra Stewart, practices in Antioch, Lombardi said.

The newborn's parents, Jeter and Thomas Harley Sparks, were in the area visiting family for the holidays, she said.

Also Tuesday morning, Kendall Maghuyop was born at midnight at Alta Bates Summit Medical Center in Berkeley, hospital spokeswoman Carolyn Kemp said. Born premature after 33 weeks, she weighed only 4 pounds, 9 ounces.

The baby's mother, Christina Susim, 29, had been going through preterm labor since Halloween and has been in the hospital for two weeks, Kemp said.

"She's my little miracle. I'm still in shock," Susim said through Kemp. "But my little miracle hung on tight, and she's very strong.

"Even though it's my fourth child, when you get to see them and hold them and hear their first cry, it's incredible."

The first baby born in the South Bay on New Year's Day popped out at Santa Clara Valley Medical Center at 3 minutes after midnight.

It was a boy, weighing 8 pounds and measuring 20 inches.

Staff writer Chris De Benedetti contributed to this story. Contact Natalie Neysa Alund at 510-293-2469. Follow her at Twitter.com/nataliealund.