They were born at 31 weeks by Cesarean section to Tressa [Molvanto], who is 36, The Woman's Hospital of Texas in Houston says.
The couple had been trying for one brother or sister to keep their little boy Memphis, now 2 years old, company. At 10 weeks, they learned she was having twins. But when the couple went in for Tressa's 12 week check-up, they learned she was carrying not two, but four babies.
"If I wasn't already on the table lying down, I'm pretty sure I would have hit the floor," Tressa told TODAY.
Manuel's immediate reaction was jubilation.
"The first thing I said was 'Home run!' and then I started jumping up and down," he said.
The Montalvo's doctor says this delivery is a very rare event.
"The incidence of spontaneous quadruplets is somewhere of the order of 1 in 500,000," said Dr. Brian Kirshon, a specialist in maternal and fetal medicine at Houston Perinatal Associates. "And then if you take two sets of identical twins in the quadruplet set, the incidence must be one in many, many millions. It's an extremely rare occurence."
Image: Quadruplets, via Shuttterstock