Interior Nancy McDaniel M.D. A normal heart has four chambers and four valves. As the blood goes through the lung arteries it picks up oxygen and becomes red blood. In a normal heart the red blood and blue blood do not mix, there are no holes, and the valves are not narrowed. Congenital Heart Disease happens in less than one percent of all babies.
Some heart disease is mild and some is severe.
Most can have some sort of therapy, either medical or surgical.