Twins are doing well, dad says.

DENNIS QUAID says his traumatic hospital scare has a happy ending -- four-month old twins THOMAS BOONE and ZOE GRACE are now healthy and thriving.

"Their progress and their development appears to be completely normal -- aside from being a Quaid," he jokingly told People.

"It's the greatest thing to hold those kids and see their faces because we had a happy ending," he added. "It's great to be a normal dad with the normal problems of not having enough hands for both of them."

The actor, who is forming a foundation that will focus on reducing medical mistakes, spoke about the twin's health crisis at the Association of Health Care Journalists's annual conference in Washington, D.C. on Thursday.

"I do have a greater appreciation of life in general," he told the crowd. "If they hadn't made it, it really would have changed my life. But they did survive. So it changed my attitude."