Owen and Emmett Ezell were joined at the abdomen and shared a liver and intestines when born. They were separated at Medical City Children's Hospital last August.
Mother Jenni Ezell says the now-9-month-old twins can sit up and that they try to coo over the trachea tubes that help them breathe. They are fed through tubes in their abdomens.
At a Wednesday news conference, she described them as "very interactive, very social little boys" who "flash smiles and wave" at visitors.
Neonatologist Dr. Clair Schwendeman says he is optimistic for the still "fragile" boys.
The twins will spend the next month in an inpatient rehabilitation center before being allowed home.