Sleep tight baby

"Babies' auditory processing or hearing sense is actually the most important sense they have for the first two years of their lives, the sense that gathers the most information about their world," said Dr. Collins, an associate fellow in music, mind and well-being at the University of Melbourne, Australia, and the author of the book “The Lullaby Effect.”
Babies may be able to fall asleep faster with the background.
White noise can block out household noise such as older siblings.
Some infant white noise machines have a heartbeat setting mimicking the mother, which may be comforting for newborns.
White noise may aid sleep
The most obvious benefit of white noise for babies is the fact that it could help them fall asleep. If you notice your baby tends to fall asleep at noisy times outside of regular nap time or bedtime, they might respond positively to white noise.
Your baby might be accustomed to being surrounded by noise, so a completely quiet environment could have the opposite effect when it comes time to sleep.
Sleep aids can mask household noises
White noise machines could also benefit families who have multiple children who are different ages.
For instance, if you have a baby who needs a nap, but another child who no longer takes naps, white noise can help block out noises of siblings to help your baby sleep better.