Shellie and Greg Tucker, parents of Allison, left and Amelia, present their nine-month-old girls who were formerly conjoined twins at Children's Hospital of Philadelphia (CHOP) Thursday, Dec. 20, 2012, in Philadelphia. Surgeons at CHOP separated the Tucker girls during a seven-hour operation in November. The infants from Adams, N.Y., had been joined at the lower chest and abdomen. They shared their chest wall, diaphragm, pericardium and liver. (AP Photo/Matt Rourke)

Associated Press
Shellie and Greg Tucker, parents of Allison, left and Amelia, present their nine-month-old girls who were formerly conjoined twins at Children's Hospital of Philadelphia (CHOP) Thursday, Dec. 20, 2012, in Philadelphia. Surgeons at CHOP separated the Tucker girls during a seven-hour operation in November. The infants from Adams, N.Y., had been joined at the lower chest and abdomen. They shared their chest wall, diaphragm, pericardium and liver. (AP Photo/Matt Rourke)
Shellie and Greg Tucker, parents of Allison, left and Amelia, present their nine-month-old girls who were formerly conjoined twins at Children's Hospital of Philadelphia (CHOP) Thursday, Dec. 20, 2012, in Philadelphia. Surgeons at CHOP separated the Tucker girls during a seven-hour operation in November. The infants from Adams, N.Y., had been joined at the lower chest and abdomen. They shared their chest wall, diaphragm, pericardium and liver. (AP Photo/Matt Rourke)
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