An eight-year study of 218 couples found 90 percent experienced a decrease in marital satisfaction once the first child was born.
“Couples who do not have children also show diminished marital quality over time,” says Scott Stanley, research professor of psychology at University of Denver. “However, having a baby accelerates the deterioration, especially seen during periods of adjustment right after the birth of a child.”
— Moraleja: Si te casas, rápido o lento, todo se irá al carajo. Visto en el blog Pure pedantry.