The 2-year-old twin girls, Angelina and Angelica Sabuco, were joined at the abdomen and shared a liver.
They were separated Nov. 1 in a 10-hour long operation at Lucile Packard Children's Hospital in Palo Alto.
"They are recovering very, very well," said lead surgeon Dr. Gary Hartman. "Our goal is to return as many children as we can to happy, healthy lives."
Their mother is extremely grateful. She said when the girls woke up after surgery they looked around and called out "mama."
"So God has always, has a purpose, has a purpose for everything," said mother Ginady Sabuco. "And I thank God now, because they are now, my twins are separated now. And I thank God now, with the help of our medical team."
The girls are sleeping in separate beds, their appetites are growing and they are learning how to walk again.
They also will continue physical and occupational therapy to build up their strength and develop their motor skills, the hospital said.
The Associated Press contributed to this story.