Your baby is very very very well protected inside your tummy under many layers so it’s perfectly normal for baby not to hear these sounds. Also even if they can hear, it’s like white noise to them. Even if you’re playing the music from your phone and putting it near your tummy, baby might not react to it. Not because they can’t hear, but some babies only react to certain sounds. For my baby, everytime “Happy” comes on while I’m in a grab, or happy birthday when I’m watching videos, she will keep moving. If I played Mozart or baby instrumental musics, she doesn’t react to them hahah. So don’t worry~
You can try play some dolphin sound/music. The baby might react. I heard from my friends recently and played the music my baby have quite a bit of movement. But I not used to the dolphin sounds so only on for awhile to try
my baby reacts to scorpions wind of change or still loving u 😅 try different genre your baby got their own 'character' too 😃