Congratulations!!! I'm very excited for you! He's a beautiful boy. Like 40 said, the time is just going to fly by (I honestly can't believe my oldest is 19...I was just relaying a story about her from when she was about 7 or 8 months old to dcr, and it really only feels like it was a few years ago).
You can't begin to understand or take to heart enough when someone tells you to slow down & really, truly enjoy this time. The next 4 years, imo, are the most amazing. Everything your child does will be brand new to him...and it's never the "first time" again. Being a parent is ALWAYS rewarding, even through the rough stuff, but nothing compares to those first few years. You'll always wish you could get 'em back after they're gone.