@11 - it's called the household theory of fertility. The more education women are afforded, the more they can earn, and the more stable their lives, the fewer children they tend to have.

That's not to say that the end result of that is large swaths of women having zero children, and the way to get women in highly-developed societies to have two or three IS making maternity *financially* feasible. That said, I don't know what Denmark could do on that front. Work schedules are flexible, maternity and child care is affordable, maternity and paternity leave is generous, and parenting is treated as a team effort. Sometimes societal preferences can't be budged through policy, and, who knows, maybe they're just seeing a "waiting" preference given a slightly shaky economic recovery.