hi Flossie, I'm a paramedic and have pulled out my stethoscope a few times. We have heard the heart beat only once and it was so very quiet. We had an appointment with the ob and new the position of the baby and we think that is how we found it. That wasn't until 26 weeks. haven't heard it since. Mothergoose, our little one likes to play that game with us too! How do they know?!