Drum roll...

First, the baby is healthy and did lots of cute things for us while we watched him on the ultrasound.
Second, yes, I did just say "him." It's a boy! I knew it was going to be a boy! I'm glad Evan will have a baby brother. Yes, there is a part of me that wanted a girl, but not enough to try for three kids. We are done after this one.
I asked how certain the doctor was that it was a boy (and not just the umbilical cord or something). She said, "I guarantee it."
He was so cute during the ultrasound. We saw him gulp fluids. I didn't see that with Evan. He opened his mouth and gulped 6 times for us. He also moved around a lot. When we saw Evan's ultrasound, he did sommersaults and sucked his thumb for us. This baby didn't do either of those things, but kicked and punched and arched his back.
He appears to be healthy. He has 2 arms, 2 legs, no club feet, a spine that is closed at the top (no spina bifida), working kidneys and bladder, 2 brain hemispheres and 4 heart chambers, a strait and very clear spine, and long legs. I could tell during Evan's ultrasound that his legs were very muscular, with rounded calves. This baby's legs looked long and lean. But we're talking in millimeters at this point, so I could be wrong...
I couldn't really see his facial features. I think this ultrasound machine was not as high of quality as Kaiser's. Too bad... we'll have five months to see his little face.

Here is how Evan feels about having a baby brother:

Me: Evan, there's a baby inside my tummy. Do you want to have a baby?
Evan: (lifting his shirt and looking at his tummy): No.

Later...
Evan (pointing at my tummy): boo boo.
Me: No, that's not a boo boo. That's a baby. There's a baby inside mommy's tummy.
Evan: No baby! Boo boo! (He thinks i have a boo boo because we had to go to the doctor's office and she rubbed that goopy stuff on my tummy).