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When Rosie and Ruby Formosa were born joined at the abdomen, they were given a 20 percent chance of survival. They shared part of their intestine and required immediate surgery.

But four years later, the twins are starting kindergarten, something their mother never could have imagined. And the Internet is buzzing about precious photos and videos of the girls on their special day.

The girls' mother, Angela Formosa, told BBC News that her daughters were “very excited” to start school.

"When I was pregnant I didn't think I'd ever see their first day at school, so it is really amazing, and all thanks really,” she said.

Even the pediatric surgeon at the hospital where the girls were born showed his excitement.

"It's always a joy to witness patients' progress and to hear that they are reaching new milestones— this makes the job we do all the more rewarding,” Professor Paolo De Coppi he said.

According to the University of Maryland Medical Center, the condition occurs in one in 200,000 live births.

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