Falling asleep on the breast or bottle
It is natural for a newborn to fall asleep while sucking at the breast, a bottle, or a pacifier. When a baby always falls asleep this way, he learns to associate sucking with falling asleep; over time, he cannot fall asleep any other way. This is probably the most natural, pleasant sleep association a baby can have. However, a large percentage of parents who are struggling with older babies who cannot fall asleep or stay asleep are fighting this powerful association.
Therefore, if you want your baby to be able to fall asleep without your help, it is essential that you sometimes let your newborn baby suck until he is sleepy, but not totally asleep. When you can, remove the breast, bottle, or pacifier from his mouth, and let him finish falling asleep without it. If you do this often enough, he will learn how to fall asleep without sucking.