A Texas couple experienced twice the amount of love on Valentine's Day when they welcomed two sets of identical twins.

Tressa and Manuel Montalvo became parents to a tandem of twins last week after they were delivered within minutes of each other at a Houston hospital.

According to the Woman's Hospital of Texas, where the babies were born, the odds of such a birth occurring naturally is one in 70 million.

Montalvo says she and her 43-year-old husband planned the pregnancy but didn't use fertility drugs.

In her words, "I guess we just succeeded a little too much."

The Houston Chronicle reported that the boys, who were delivered at 31 weeks, developed in separate placentas.

Born at 8:51 am, Ace weighed 3 pounds, 10 ounces, and Blaine weighed in at 3 pounds, 15 ounces. Sons Cash and Dylan arrived a minute later - Cash at 2 pounds, 15 ounces, and Dylan at 3 pounds, 6 ounces.

"We tried to stick to the A-B-C-D theme when naming them," Tressa told the Chronicle. "We didn't expect it. We were trying for just one and we were blessed with four."

The couple at first thought they were having twins until their doctored detected a third heart beat.

"We couldn't have been more surprised when Dr. Kirshon told us we were having four babies and that they were two sets of twins," said Manuel in the Chronicle.

While the Montalvo's now have a full brood with five young sons, the couple is still hoping to try again for a little girl.

The Associated Press contributed to this report.

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