Jensen's mother, Sandy Byrne, had two other babies (one was around 7 pounds; the other 9 pounds, 15 ounces) and studies suggest more babies could decrease breast cancer risk.

She also nursed her children, which could mitigate her risk even more.

Still, Byrne said she is not worried about breast cancer.

"I'm too busy to stress," said Byrne with a laugh. "I have a 10 pound baby I have to chase all day."