The decline is steepest among women in their 40s who have an M.D. or Ph.D. Last year, 20 percent reported having no children, compared with 35 percent in 1994. Among those who have a master’s degree or higher, 22 percent are childless, down from 30 percent in 1994.I find this trend encouraging because it suggests we are making some progress in the whole career/family balance thing for women. The idea was widespread not so long ago that giving places in Ph.D. or MD programs to women was a waste, because they would have children and stop working, but these days nobody rolls his eyes over the notion of researchers or doctors who are also mothers.
It also means more men are interesting in marrying highly educated women.
On the other hand it also means that in more and more families people are trying to do half the work of raising children and keeping a house on top of a demanding career, which I think is crazy even though I do it myself. There ought to be a better way, but I don't know what that would be.