TIM CARNEY: What a woman wants: More babies.

There’s evidence that the birth dearth is explained by a large portion of women not having as many babies as they want.

Pew looks at surveys of European women near the end of their childbearing years and finds that while most have as many children as they want, about 30 percent have fewer than they would want. Only ten percent have more.

In the U.S., 40 percent of women near the end of their childbearing years have fewer children than they would like.