"It was such a thrill for us to see the girls next to one another again," Aida Sandoval, the mother of Eva and Erika, told The Associated Press.
The pair have been recovering in the same room in the intensive care unit at Lucile Packard Children's Hospital Stanford in Palo Alto, but in different beds.
The hospital's Dr. Meghna Patel said the twins are progressing well. "They have had no significant complications," she told The Associate Press. The twins are conscious and breating without ventilators. They are expected to remain in the ICU before moving to an acute care unit.
Prior to the surgery, they shared a bladder, liver and parts of their digestive system and a third leg. Eva and Erika each retain portions of the organs they shared, and each still has one leg.
ABC News' Rachel Katz contributed to this report.