White noise can be as simple as a radio tuned to no station so there is only static. Or you can get a white noise generator that provides a variety of soothing sounds. Nature's Cradle by Infant Advantage also lulls a baby to sleep with sound and motion. By 4 months of age, most infants should be able to sleep through the night without feedings. Since infants derive such great comfort from feeding, it should come as no surprise that a feeding can soothe a crying infant even if he isn't hungry.
Some infants become dependent on having feedings to soothe themselves and put themselves to sleep.
But if they aren't offered the feeding, they are wide awake and screaming. Aside from that, if your baby is old enough to sleep through the night and really isn't taking a full feeding, then he is using the bottle to put himself to sleep. Unfortunately, he may continue to demand a feeding every time he becomes slightly awake in order to put himself back to sleep. This is known as Trained Night Feeding . Sleep is a necessity, but how we go to sleep is a learned behavior.