Read about this app (some forum) and I downloaded it and tried
it out right away. You use your iphone as a doppler and listen with
headphones (it's not a real "doppler" - the app use the microphone to
"filter & amplify baby's heart beat sound").
it took us
awhile to find the heartbeat and it does not sound as clear as a real
doppler, but it definitely worked and made us happy :-).
We even recorded the heartbeat and post on facebook. it's so cool!!!!
All this was with our first child

and now using it with the new baby... so have fun :P
Re: iphone app named my baby's beat