That’s better odds than getting hit by lightning in a given year, which ranges from 1 in 775,000 to 1 in a million.
Keith Devlin, a mathematician at Stanford and NPR’s Math Guy, stresses that the odds are even better that a mother somewhere in the United States will have a child born on the same date and time as a sibling in a given year.
But Ryan was adamant throughout the pregnancy that the babies would be born the same day – even predicting correctly that Sarah would give birth a week early.
“I was just convinced that we’d be here at the same time,” he said.
Siblings end up sharing a lot of things, willingly or not.
But unless they are twins, not too many share the same birth date — down to the minute.
The two families recovered on the same floor in the Connors Center.The couples’ other children, all of whom were born at the Brigham, are excited to welcome home a new sibling and cousin each, Sarah said.“We’re used to doing a lot of stuff with our siblings and families, so it doesn’t really seem that weird to us,” Matt said. But Philip Stark, a professor of statistics at UC Berkeley, isn’t comfortable with the 1 in 500,000 number.Too many variables come into play to figure out the precise odds, such as when a woman is fertile, how long a couple tries to conceive and parents’ efforts to space their children apart.