Congratulations! I have two and will never forget the time I've spent with them. My best guess is there is 75% of their personality/philosophy set from the start and you can mold the other 25%. I remember my neighbor telling me how good their son was and ours was a little hellion. Then they had their second and he was their little hellion, our second was as calm and quite as they come. Kids are great. Just don't tell your wife you want another one 24 hours after the first. The large bump on my head is proof of that! Have fun, teach them well and be aware my daughter has enjoyed doing more with me than my son ever will. Mama's boy, daddy's girl...