When they get older, Logan, Eli and Collin Penn may blanch at the notion they wore nail polish to their first press conference. But it's the only way their parents know how to tell the boys apart right now. The identical triplets were born last Wednesday at North Shore University Hospital - an event so rare that an obstetrician estimated it might happen just once in 200 million births.

The triplets' mother, Allison Penn, was impregnated with just one embryo through in vitro fertilization, said Dr. Victor Klein, a specialist in multiple births and high risk pregnancies who delivered the boys. That embryo split in half and then one half of that split again, he said.

"This is the first one we're aware of in the literature in the country in which they only put back one embryo" and a woman gave birth to triplets, said Klein. "Most people put back two or three embryos and you just never know."

Klein said identical triplets are born at a rate between one in 60,000 and one in 200 million, depending on the research.

Full report: Woman gives birth to identical triplets

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