As I mentioned in my previous post, marital satisfaction tends to go down after the arrival of the first child if the pregnancy was not planned or, if it was planned, if one (or both) both parents were not in agreement about having a baby or were not enthusiastic about it. Put another way, couples who planned their pregnancy and where both spouses were excited about it can maintain or even increase their satisfaction after the baby arrives.
Parenthood sometimes causes a couple to revert to the “traditional” gender roles because the woman quits her job to stay home with her child. Some couples are quite comfortable with the traditional roles, but for others it can be a source of stress. The man way resent his wife for not contributing to the family’s income, and the woman may resent her husband for not helping with housework and childcare. Hopefully, the couple had decided well in advance whether the woman would stay home or would continue working, and had planned accordingly.