My wife and I are in the process of selecting a donor, which has been a lot of fun. Especially since we've been able to learn about each other even more. it's been wonderful seeing what we both really believe in and the support that we've been giving each other through this journey of finding the right sperm. The next step is how many vials do we need? I keep reading the statistics 3-4, recommended 6. We plan on purchasing for a second baby too, so that makes 12. My concern is that what if buying only 12 isn't enough? And even so; just buying too much. How does one really know how many it will take? I am 31 and healthy.... can any one give us any advice?