Research from the University of Denver on 218 couples, showed that in 90% of couples, having a baby accelerated deterioration of their marriages.
The researcher “cautions against concluding that children damage overall happiness in life” – but just look at those cold hard statistics.
I think what it most likely shows is that having a baby, or getting married, is not a suitable recourse in a failing relationship.
The research appeared to focus solely on partners relationships with each other, not the relationship between parents and their kids. Perhaps their isn’t enough love to go around.