More than 1 in 3 children on the Continent are born to unmarried couples, a sixfold increase from the 1970s.
Germany's Bild newspaper has called it "the Steffi Graf trend." And though a pregnant Ms. Graf ended up marrying Andre Agassi a few days before their son, Jaden, was born, Bild has a point.
Across Europe, the number of children born to unmarried couples has risen sixfold over the past 35 years to nearly 1 in 3 of all babies, altering the face of the European family beyond recognition - and beyond recall - say demographers and social analysts.
While most governments have regarded the transformation as simply a sign of the times, some experts are sounding the alarm.
Given the relative fragility of de facto unions - and the social implications of single-parent families - "the rise in births outside marriage is a real cause for concern" warns John Ermisch, an economics professor at the University of Essex in England.
If Prof. Ermisch's findings that de facto British unions break up more quickly and more often than marriages apply throughout the continent, points out Dr. Peter Brierley of the Christian Research group in London, the increasing numbers of single-parent families in Europe will mean governments will have to rethink policy on a wide range of issues.
More housing will be needed for more families, more childcare facilities will have to be provided, more thought will have to be given to employing single mothers, and more attention paid to the particular social and educational needs of youngsters brought up by only one parent. All this, with many European countries already faltering under the strain of generous state welfare programs.
Reflecting different social, religious, and economic traditions that have shaped the 25 countries in the European Union (EU), the number of births outside marriage varies widely from one end of the Continent to the other.
In Sweden, the figure is 56 percent. In Greece it is 4 percent. In between come France with 48 percent, Britain at 42 percent and Germany at 28 percent, according to the EU's official statistics branch, Eurostat.
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