Around one in 11 million. Those are the odds medical experts gave Rachel and Marco Vargas for their rare pregnancy.

To provide an increasing body of knowledge related to umbilical cord care, a literature review was conducted to study the evolution of umbilical cord care, to evaluate the scientific evidence used ...

The odds of having identical quadruplets are one in 11 million births. With Rachel Vargas's complications, her babies are one in 40 million.