The BabyStemo App

Specially designed for EXPECTING mom and NEW mom
  • Listen to your baby's heartbeat from the 25th week
  • Record your heartbeat to soothe your baby after he or she is born

Let’s listen to some audio samples recorded with BabyStemo

The internal speaker of a smartphone is generally not good at playing such kind of sounds, so please wear your EARPHONES 🎧 and adjust the volume 🔊 to listen.

These sounds were recorded with "Turbo" on. The baby's heartbeats are more audible. It is recommended to use this mode when you look for the best location to listen to your baby's heartbeat.
These sounds were recorded with "Turbo" off. The baby's heartbeat sounds are less audible but more natural. It is recommended to use this mode after you have found the best location to listen.

Listen to, record and share your baby's heartbeat

The Stemoscope device picks up the weak audio signals and send to a smartphone wirelessly. The App denoises and amplifies the audio signals and make them more audile. Then you can hear, record and share the precious moment through the App.

Work differently from a Fetal Doppler

Different from Fetal Doppler, which emits ultrasounds to the baby's heart and synthesizes the heartbeat sounds based on Doppler effects, Stemoscope denoises and amplifies the weak sound signals from the baby's heart and make them audible.

 Fetal DopplerStemoscope
UltrasoundYES. According to the U.S. Food & Drug Administration, the effects of excessive tissue heating and cavitation caused by ultrasounds are not known (source).NO. Stemoscope does not use ultrasound.
GelYES. Ultrasound coupling gel is needed.NO. Since no ultrasound is used, no gel is needed.
Natural soundsNO. Just provide an audible simulation of the heartbeat.YES. Stemoscope amplifies the real heartbeat sounds, which are natural.

Make and play your own 'womb sound' lullaby to your baby

Womb sounds can help soothe crying baby. Mom's heartbeats are the major rhythms of womb sounds. Place the Stemoscope over your heart to record heartbeats and play them to your baby after he or she is born.


Stemoscope and the associate App are not medical device and should not be used to monitor your baby's health.