NPR's Morning Edition had an interesting discussion here on whether or not children make you happier. Most of the comments were from people who believed that children most assuredly did not add to happiness:
Pride and Prejudice, by Jane Austen, Jane tells Elizabeth that, she hopes Elizabeth will find someone to marry like Bingley, so she can be as happy as Jane is. Elizabeth responds: "Til I
have your disposition, your goodness, I can never have your happiness."
I think raising children, if you do it lovingly and carefully, increases your
capacity for happiness (and sorrow, but that's another day). The wrenching love
you feel for your children stretches your heart, and makes you more able to
love and care for others around you.
For me, that's happiness.