When I read the book it seemed as though she was repeatedly describing my thoughts for as long as I can remember - at least since I was two! The sex stuff was a bit much, but otherwise she speaks for me, very precisely. Accordingly, I am comfortable saying that she would laud anybody who loves living for their children, as I do (and would not confuse it with altruism, which is evil). The fact that she was childless is imaterial.
Since Rand speaks my thoughts, but I have no standing when it comes to stating her position on children, I went back to AS for reference. After paying closer attention to John Galt’s speech (who I think was her stand-in), I believe that the birth of a child, when it is to a mother who values children, represents the product that helps her achieve happiness, selfish though that may be. This is completely consistent with her philosophy.