I can't remember where I read it (a book, website? I can't remember!) but after 34 weeks or so, (maybe earlier? Really, I have a terrible memory!) the baby's heartbeat can be heard without a dopplar! DH loves laying his head on my belly at night and hearing her heartbeat! I love that I get to feel her all day, but I have to say that I'm jealous that I can't hear it.
He just puts his ear right where the doctor always finds the h/b and he can hear it. I love it!