It looks very much like baby number four is a....Girl!
Which makes things very symetrical. I think this is God's special grace to us. Matt and I are always striving for symmetry, mostly spacially, but in many other ways as well.
In a fit of passion, early in our engagement Matt said, "that's why I fell in love with you."
"What? Why did you fall in love with me?"
"Because your face is so symmetrical."
I'm sure there are other reasons, but that one seems to come up more often. So, for the time being, things remain symetrically balanced, and we are completely delighted.