I downloaded this today after reading that it was on sale and I first listened to the examples, found my own heartbeat, then was easily able to find baby's...of course, as I was pushing my phone against my belly, he was moving away from it so I had to move around quite a bit before I got him to hold still long enough to hear it good. I thought it was pretty fun to do though and my 4 year old got a kick out of it and I think it helps him feel more connected to his new brother :) Did anyone try it? :)
P.S im 28 weeks and you must put the device on airplane mode, so there will not get any transmission.