I happened to come across a pro-abortion blog, written by a woman who has had an abortion and says she does not regret it. After the abortion, even though she is now married, she deliberately chose not to have any children. Instead, she has two cats.
I could not help but feel a little sorry for her. I suppose cats have some advantages. Perhaps the parents out there could comment on how your children have enriched your life. Would you trade your kids for two cats? Cats, not being persons, are not able to have a real relationship with you. Cats cannot say "I love you," or bring you a birthday present or visit you and take care of you when you get old and sick.
But more importantly, having children is a way that we can make of ourselves to another person. The "law of the gift" means that it is only in making a gift of ourselves that we can truly find ourselves. I don't mean to say that everyone is required to have children, since God calls some people to other vocations and some people bear the cross of not being able to have them, though they would want to. But to deliberately block them out when one chooses marriage, whose outcome is normally children, is the problem.