Welcome to the board, Rebecca, and congratulations on your pregnancy!
Here's a nice article with lots of good links:
http://www.circumstitions.com/Itsaboy.html
Others have covered your questions very well, but I want to reinforce a couple of things:
1. Your baby is not sexually active, therefore he does not need protection from STDs. If he decides FOR HIMSELF that circumcision will offer him some protection (in addition to safe sex practices), he can make that choice for himself.
2. My twin boys are 14 years old, and found out about circumcision when they were 8 (they heard the word in a church sermon, of all places, and asked what it meant). They were horrified at the idea - they couldn't imagine why anyone would want to cut off their foreskin. When we explained that most men don't choose it for themselves, but their parents have it done to them when they are babies, they were appalled. We explained that their Dad was circumcised, and one of the boys said "I thought Dad just kept his foreksin pulled back all the time". It never occured to either of them that his foreskin had actually been cut off - why would it? Unles you've been conditioned to believe that it is "normal", it is a very bizarre concept. My other son said "Poor Dad - he's missing the best part!"
I think THAT is the problem - it's not that men think their sons will be traumatized if they realize that their penis looks different from Dad's, it's that Dad doesn't want to accept the fact that perhaps his penis is missing something important. You don't see men with beards and mustaches shaving them off, so they match their young sons - why should they be concerned about a body part hardly anyone sees?
My DH and his brother (both circumcised) were in their 40's when they learned that their Dad had been intact. Obviously it wasn't a cause for concern in their family, any more than it is in ours (DH's brother left his two sons intact as well). The "tradition" of circumcision lasted exactly 1 generation.
As I said, my sons are 14 - almost 15. We didn't have Internet access when I was pregnant, and didn't even realize that circumcision was controversial. When we thought about it (without doing any more research than asking our family doctor about it), we had the following thoughts:
1. That's GOT to HURT! We didn't want our babies to go through any unnecessary pain.
2. All baby boys are born with a foreskin, so it must be there for a reason (even if we had no idea what the reasons were at the time).
3. If it ain't broke, don't fix it.
4. We both felt that circumcision was more of a social custom than a medical issue, and neither of us felt compelled to follow the custom. I remember one of us saying "It's going to stop eventually - it might as well begin with our boys".
Best wishes to you, Rebecca, for a comfortable pregnancy and a healthy baby! If your DH has any questions or concerns about having an intact son, please don't hesitate to come back here for advice and support.
Ann