Here is a pair of headphones that allows moms to play music directly into the womb. The BellyBuds allow you to play familiar sounds to calm your baby. You get an audio splitter to listen to the music with your baby in the womb. The kit also includes SoundBub, which is a white noise machine and Bluetooth speaker.
The VoiceShare app is available for iOS and Android devices. The speaker has a rechargeable battery and plays Malibu Beach and Mantana Rain white noise sounds.[where to get it]