Babies and Evolution

So this morning I was laying in bed with my wife with my hand on her stomach feeling Evelyn doing her morning exercises (23 push-ups, 40 sit-ups, and three rounds from a new pre-birth-Wii-type kickboxing game). I was thinking about the amazingness of birth and how cool it is that my wife has a living baby inside her belly. At various random points during this pregnancy I have been slightly jealous that my wife has a baby moving around in her belly. I mean I have experienced gas before that made my stomach do weird things, but have a solid 15 inch baby in my belly; that I have never been able to experience. Of course the other side effects to it have caused that jealousy to subside rather quickly.
How does evolution explain the capability of reproducing? I mean, I know that there are intelligent scientists out there who think that I am ignorant for believing in Creationism. And I don't really want to bash them; I just wonder how that is explained. Yeah, dirt collided and there was energy, etc... and then this all resulted in an ability for mankind and animals to reproduce. Just curious.