HTCurious-
I am not a doctor or anything, but from what I understand there has been no evidence that if the father takes finasteride it can cause birth defects or other problems with the fetus. There has been evidence of such problems when the pregnant mother comes in direct contact with a broken or split pill, but no evidence showing that such problems may come indirectly by the father taking the pills. I keep my pills far away from where my wife will be, and she knows not to come near them. I even wash my hands after taking them, just as a precaution. We just make sure that my wife does not come in direct contact with them. As I have posted in another place here, we were trying to have a baby for years and couldn't. My wife finally got pregnant about 4 months after I started taking finasteride. We have had no problems and have seen no bad side effects.
Foxlox