Texas woman has two sets of identical twins in one day

CHICAGO - 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 announced on Monday.

The four brothers were delivered at 31 weeks to Tressa Montalvo, 36, via Cesarean section at The Woman's Hospital of Texas in Houston, 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, quoted in the release.