Being a parent is an irreversible decision and not one made lightly; after all, there is another person besides the two of you to consider in the decision. Getting married without getting a bead on your partner's outlook on kids can be disastrous down the road if your opinions differ wildly. Factors that you need to consider before committing yourselves to parenthood or even getting married are your careers, living arrangements, financial situation and support system (Are relatives/sitters/other caregivers nearby who can help in a pinch?). If you disagree about whether or not to have kids, then it's not necessarily the death knell for your relationship. Examine whether or not you and your partners' timetables for having kids is compatible. If you think you'll be ready in a year or two, and he or she would like to put it off for 10 years, then that's a major difference of opinion. Then again, it does offer room for compromise. However, if you or your partner is completely opposed to having kids and the other person is dead-set on a big family, then there may not be much you can do to surpass that hurdle.