Or should be, but it's just not very clear what that even means.
I wrote about it, here and here (in that column thing I do).
"A year after graduating from college, I found myself at daily mass with a friend my age and her newborn baby. An older woman, heart-warmed by the sight of a beautiful young mother with her child, came up to us as we were leaving to tell my friend how happy she was to see a young woman living out her vocation."
And, just for good measure, here's this old piece on the same subject.