The larger size could also be a result of the GD. I think it was so incredibly aswesome to not find out, I know it will be just as fun for you! If you don't want to catch the baby like Corbin did--you could at least request that the Doc let you be the first to look at the bits and pieces and see what they are!
I bet your wife would love to hear it from you instead of the Dr. At least I thought it was cool anyway. And sons first so rock, I never had a brother so I was so glad to have a boy first--I hope you get your wish!