This thing really worked for our super colicky newborn. We found that most white noise machines didn’t really do their job when baby was screaming. At those times, as Dr. Karp teaches in his life-saving book “The Happiest Baby on the Block”, you need a loud sound, so the baby can hear it over his own screams. With this CD you can adjust the volume accordingly. The CD has 6 tracks for different situations (extreme fussiness/crying, calming to sleep, staying asleep, etc) We found track 2 especially helpful for stopping extreme inconsolable crying/screaming. It worked when nothing else (not even the vacuum cleaner) did. The problem with track 2, however, is that it can give you a headache. But I preferred a headache over baby screaming. When I couldn’t stand track 2, we used track 6 (rain), which worked great to keep him asleep during naps. Also, the tracks fade in and out, so they don’t startle you or the baby that much. We purchased a second CD for the car.