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A Texas woman has made headlines after giving birth to four babies - two sets of identical twin boys.
Tressa Montalvo, 36, and her husband Manuel, 43, welcomed the quadruplets on Valentine's Day at the Women's Hospital of Texas in Houston.
Ace, Blaine, Cash and Dylan were born by cesarean section on February 14. "We tried to stick to the A-B-C-D theme when naming them," said Tressa in a statement the hospital released.
The twins - which each shared a placenta - were not the result of fertility treatments.
In roughly 2 percent of pregnancies, identical twins are the result of a fertilized egg splitting into two embryos.
The odds of having two sets at the same time? One in 70 million, according to Dr. Alan Penzias, associate professor of obstetrics, gynecology and reproductive biology at Harvard Medical School.
"We didn't expect it," Tressa Montalvo said. "We were trying for just one and we were blessed with four. ... We planned the pregnancy - I guess we just succeeded a little too much."
The new parents thought they were having twins until their doctor detected a third fetal heartbeat. They were then referred to a maternal fetal medicine specialist who found a fourth heartbeat.
Do you know anyone who had multiple sets of twins - even if not at the same time?