When the baby arrives, you're going to want to have a white noise app on your phone. (thetoddle.com)
In a pinch you can buy a white noise app on your phone or other device. (nocrysolution.com)
But whenever we travel, we use the free Simply Noise app as white noise while she sleeps — works like magic and is quite effective at blocking out hotel noises. (rookiemoms.com)