I bought these for my wife during her second pregnancy. She loves it when the baby moves and kicks when she plays the music. We haven't used any of these devices during her pregnancy and YES, she can feel he difference! Her first pregnancy was very rough, the baby moves so much that she couldn't sleep at night or rest during the day. THANKS to Pixie Tunes, which made my wife's pregnancy much smoother. Now she can sleep at night and rest during the day while baby is enjoying the music. This has been truly a blessing. My wife is in love with these and so does my baby to be :-)