Children's Medical Center Dallas has a huge fan in actor Dennis Quaid.

If the hospital that treated his twin babies had been equipped as well as Children's, they might not have received near fatal doses of Heparin last year.

The actor visited Children's today on a crusade to reduce the effects of human error in hospitals across the country.

The smile and charm melts hearts - it's what Dennis Quaid is known for.

But after his two youngest children nearly died in a Los Angeles hospital last year, he believes his calling as an actor has taken a back seat.

"Just seeing that they'd survived. These little kids, they were 12 days old but felt like they were going to help change something," he said.

Dennis, along with his wife Kimberly, is on a quest to make hospitals safer. They heard about Children's barcoding program that tracks medicines, treatments and staff through a bracelet on every patient and wanted to see it for themselves.

Quaid wants every hospital to have a similar plan. He says human error led to the Heparin overdose. It was 10,000 times stronger than prescribed. Seven times, he says, someone missed the opportunity to catch the mistake.

"We certainly don't blame nurses for what happened because they're human," he said.

"At the beginning there was a lot of anger, shock and fear. That we had to work through but we're lucky. We had a happy ending because our kids are healthy and happy."

The Quaid twins are now nine-months-old and healthy, but Dennis Quaid's advice if you're in a hospital doesn't have an electronic monitoring system: never leave your child's side at a hospital and ask a lot of questions.