So I got this today! I thought I found babies heart beat right away. I realized it wasn’t babies heart beat but my own I thought it was babies because the Doppler originally read 120 but then started declining to low 100s I knew babies heart beat couldn’t be that low. After watching some videos on YouTube I felt as if I was able to distinguish the difference. I couldn’t find babies heart beat at first and I was disappointed but not fearful. I took some time away and went back later and found babies heart beat! The sound was very different from my own and the Doppler was reading between 165-170! I was very excited!! I do realize these things are harder to use than I anticipated but a little patience goes a long way! I love it. I won’t be using it again for a while I don’t want to over due it but it was fun! And worth it!