In the practice of many parents, we have learned that monotonous sounds (the so-called "white noise"), for example, the clamor of a fan, vacuum cleaner, are more effective as a lullaby for a child's sleep than music or singing.
In the studies conducted, most infants were able to fall asleep to white noise within five minutes, while without it, 25 percent of newborns fell asleep during the same time.
White noise helps the child to calm down, speeds up the time to fall asleep.
Also, the baby falls asleep better (as he calms down) to the sounds outside the window, the sound of the rain or the uproar of the street.
When using white noise, the newborn does not wake up every 20 minutes, which also allows the mother to rest better.