Most conjoined twins never survive pregnancy. And of those that are born, only about 25 percent will live.
However, twin girls from the Philippines are beating the odds.
Angelica and Angelina Sabuco will soon wake up separated for the very first time.
The two-year-old twin girls were born connected at the chest and abdomen.
After what doctors are calling a miracle operation, the two girls are recovering in different hospital beds.
"We're very pleased. Things basically could not have gone better," Dr. Gary Hartman, lead surgeon at Lucile Packard Children's Hospital at Stanford said during a news conference.
The surgery took a team of 20 doctors from ten hours to complete.
Angelica and Angelina shared a liver and diaphragm, but had separate hearts and lungs.
"Our long term prognosis -- we would expect happy healthy, set of girls," Dr. Hartman said.
The girls are in the pediatric intensive care unit.
Dr. Hartman says they will spend the next few months learning how to function on their own.
"They're very resilient. So my expectation is that they will bounce back from this quite well," he said.
The girl's mother says she can't wait to have very ordinary twin daughters
"I thank God for everything this is a dream come true," said Ginady Sabuco.