My mom had a cardiovascular accident when I was young, 20 years ago. She was hospitalised for a long time and had to get a cardiac valve.

The valve makes a really loud beating heart noise, she hates it because she feels like it makes people unconfortable and she has to hear it all the time.

Recently I had a baby, she is 6 month old. We were at a restaurant and she was very fussy. My mother took her to let me eat a bit, and my baby cuddled with her, she instantly relaxed when she heard the loud beating noise and kept her head resting on her chest (I think it reminds her of the sound of my heart when I was pregnant with her?).

I'm not sure if it's related at all, but my mom was soooo happy, she kept talking about it all day long.