Texas woman gives birth to 2 sets of identical twins

The Houston hospital said the chance of giving birth to two sets of identical twins is about 1 in 70 million.

A Texas mother had a one-in-70-million kind of Valentine's Day this year when she gave birth to two sets of identical twin boys, a Houston hospital said Monday.

The four brothers were delivered at 31 weeks to Tressa Montalvo, 36, via cesarean section at The Woman's Hospital of Texas, according to a news release from the hospital.

Tressa and Manuel Montalvo Jr. were not using any fertility drugs and had just hoped for a little brother or sister for their 2-year-old son, Memphis, according to the release.

"We planned the pregnancy — I guess we just succeeded a little too much!" said Tressa Montalvo, as quoted in the release.

Texas woman gives birth to twin twins: Tressa Montalvo delivered two sets of identical twin boys on Feb. 14, 2013, Valentine's Day, at The Woman's Hospital of Texas in Houston. IMAGEAP Photos: Houston Chronicle: Brett Coomer

When Montalvo was 10 weeks pregnant, her physician told her she was having twins, and on a subsequent visit, the doctor detected a third heartbeat. The Montalvos were later informed they were having four babies — not quadruplets but two sets of twins.

The odds of delivering two sets of naturally occurring identical twins is somewhere in the range of 1 in 70 million, according to the hospital. Two boys shared one placenta, and the two other boys shared another placenta.

Ace and Blaine were born at 8:51 a.m. Feb. 14 and weighed 3 pounds 10 ounces and 3 pounds 15 ounces respectively. Cash and Dylan followed a minute later, weighing 2 pounds 15 ounces and 3 pounds 6 ounces respectively.

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

Manuel Montalvo said in the release that they're not done yet: He still wants a girl.

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