Texas woman has two sets of identical twins in one day

TEXAS: A Texas mother 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.
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.