A free app for Android, by TMSOFT.

White Noise Baby is a free app that helps you to block unwanted sounds that may disturb your baby while he is sleeping, such as a loud neighbor, a noisy wind, or the sound of your own baby’s crying. It helps you to reduce stress and helps your baby to fall and stay asleep. It includes sounds that are similar to softly shushing in the ear of a child, which helps him to fall asleep and stay asleep.

There are many sounds from which you can choose, including hair dryer, fan, vacuum cleaner, wind chimes, and more. You can also play classical music tracks.

If you want to prevent the device from being interrupted, set it on Baby Mode.