Make sure to start keeping track of your wife's cycles, and study up on when it's the best time to try. For a normal healthy woman there's really only a couple days a month she's at her most fertile, and those are the days you want to try. Look up NFP (natural family planning) to learn more. My parents used it and it was very successful. I know a lot of young families that are using it too and getting pregnant left and right. The key is to hit those days, and even if you aren't successful one month, you can try again the next month, and more than likely you'll get it within a few tries. Good luck!