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Before my husband, Tom, and I became parents, our sharpest moments of marital rancor involved where to go for Sunday brunch. Then we had a baby and began battling nonstop. Like all new parents, we were semi-deranged from sleep deprivation and inexperience, but the force of our anger took us both by surprise.

We’re hardly unique. Numerous studies show that marital satisfaction—especially for women—takes a dive after couples become parents. A recent study of more than 12,000 parents published in the American Sociological…