Any new situation, especially newborns with their constant physical and emotional needs, will stress a relationship. If there were already serious issues, it will bring them out. If there were subtle issues, it will bring them out. Dealing with and discussing how to deal with the new decisions of the new situation, also rob you of time you would have previously spent on maintaining or fixing your relationship.Now, specifically to a new baby... Your body is going through TONS of changes, including weight, hormones, electrolytes, just in recovering/reverting from a pregnancy. On top of that, there's often sleep deprivation and financial worries. And the stress we put on ourselves trying to do everything right to get this little person off to a great start. It's no wonder that our relationships suffer.My husband and I had to sit down and talk through the problems that we would have never seen if not for the baby. (We had these problems before Baby, but never addressed them directly.) It strengthened our relationship and brought us closer. I'm not saying all of it is resolved, but just talking about it and knowing that the other person cares enough to work on it, means a lot in our marriage.As to when to call it quits...My husband is from a divorced family and has had a divorce himself. He told me it doesn't matter how much YOU want the relationship to work, that building and maintaining a relationship takes two, and if the other person isn't interested, it isn't a relationship.My grandparents were immigrants who had an arranged marriage. They treated each other with respect and did was was right for their children and for their family. Emotions are, by nature, temporary, and starry-eyed love doesn't last forever. (would it be as highly prized if it did?) Loyalty, respect, and trust go a long way in building a truly lasting marriage, filled with love and happiness.If you can't talk about the problems, is it you or them? If it's you, you can do something about it. If it's them, your answer on whether to stay or go, might already be decided and laying in front of you.