Yes, I am calling the fetus Wally, but no, I neither know nor suspect that it is a boy. I don't actually have strong feelings about it either way, but if forced to hazard a guess I would say I think we may be having another girl.
When I was pregnant with Mia, we called her Lima Bean and then Beanette and then Bean and finally Mia Bean, which she answers to and is how she frequently refers to herself. This time though, since we are second-time parents I felt we needed something a little more... punk rock. That led, somehow or other, to me calling the fetus "the Wombat". Chris didn't care for that, I can't imagine why, so I started calling it Wallaby (on a marsupial kick, it seems) and that has turned into Wally.
Chris also doesn't like when I call Wally "the parasite." He's so uptight, and also is not the one hosting a parasite.
In other news, Mia made her maiden trip to Ikea today, it was a big moment, and we also learned that she can eat rotini with chop sticks. Pictures to follow.