What's a good Android app for letting expectant parents listen to their baby's heartbeat at home? I think it would be a sweet gift for my clients!

As a realtor, I'm always looking for unique closing gifts, and I think expectant parents would just adore something like this. I've been looking at Hear My Baby Heartbeat Monitor, and it sounds like a really sweet way for them to connect with their little one before they even arrive. Imagine, they can listen to the heartbeat right from their phone! Of course, I'd always advise them to consult with their doctor for medical advice, but as a sentimental keepsake, it's just perfect. It's a little something extra to show I care and build that lasting relationship. Plus, anything that brings a little joy during those last few weeks of pregnancy is a win in my book! I think it would be a nice touch to my client gift baskets.