It’s unusual to have a baby born on Leap Day, the Feb. 29 calendar day that appears only once every four years.

But the odds of the same mother having two Leap Day newborns 12 years apart are astronomical.

Jennifer Ginn, 35, of Lakewood gave birth Monday to Leap Day newborn Antonio.

Among the visitors to Ginn’s Lutheran Medical Center room to wish her well was Ginn’s 12-year-old son, Giovanni, who is also a Leap Day child.

“They’re going to be lucky, and they’re going to bring us luck,” said Anthony Ginn, Jennifer’s husband and the father of the boys.

Jennifer Ginn arrived at Lutheran about 9:30 p.m. Sunday. She gave birth to Antonio, who weighed in at 7 pounds and 5 ounces, at 3:53 a.m. Monday.

Experts say the odds of having a Leap Day baby are one in 1,461, arriving at the number as follows: There are 1,460 days over four years, plus the one Leap Day.

Babies born on Leap Day are known as leapers or leaplings.

There are an estimated 200,000 leapers in the United States and about 5 million worldwide, according to medicaldaily.com.

Anthony Ginn described Jennifer as a “happy, loving mother” who was “exhausted” after Antonio’s birth.

The couple have six children, three boys and three girls.

The family playfully teases Giovanni around his Leap Year birthdays. This year he blew out “just three candles,” Anthony Ginn said.

Now, Giovanni will have the special day to share with his new brother, Antonio.

“We are a flattered and humble family,” Anthony Ginn said. “We’re blessed to have them.”

Kieran Nicholson: 303-954-1822, knicholson@denverpost.com or @kierannicholson