"White noise is a combination of all of the different frequencies of sound. You can think of white noise as 20,000 tones all playing at the same time. Because white noise contains all frequencies, it is frequently used to mask other sounds. If you are in a hotel and voices from the room next-door are leaking into your room, you might turn on a fan to drown out the voices. The fan produces a good approximation of white noise. Why does that work? Why does white noise drown out voices? Here is one way to think about it. Let's say two people are talking at the same time. Your brain can normally "pick out" one of the two voices and actually listen to it and understand it. If three people are talking simultaneously, your brain can probably still pick out one voice. However, if 1,000 people are talking simultaneously, there is no way that your brain can pick out one voice. It turns out that 1,000 people talking together sounds a lot like white noise. So when you turn on a fan to create white noise, you are essentially creating a source of 1,000 voices. The voice next-door makes it 1,001 voices, and your brain can't pick it out any more." - from HowStuffWorks.com

These CD’s were specifically designed to calm infants. White noise is a very powerful soothing element as it mimics the sounds of the womb (blood flowing through mom's body). Since a young baby's developing neurological system is not able to tune out surrounding stimuli, the baby often becomes overwhelmed by it. White noise helps shut out these agitating stimuli. The Sleep Baby White Noise CD’s lessen the stimuli and captures your baby's attention, then settles your baby into a deep, restful sleep.