Since nighttime is scary time for little people, sleeping within close touching and nursing distance minimizes nighttime separation anxiety and helps baby learn that sleep is a pleasant state to enter and a fearless state to remain in. Belief in the language value of your baby's cry. A baby's cry is a signal designed for the survival of the baby and the development of the parents. Responding sensitively to your baby's cries builds trust. Babies trust that their caregivers will be responsive to their needs.
Parents gradually learn to trust in their ability to appropriately meet their baby's needs.
This raises the parent-child communication level up a notch. Tiny babies cry to communicate, not to manipulate. Beware of baby trainers. These more restrained styles of parenting create a distance between you and your baby and keep you from becoming an expert in your child. In your zeal to give so much to your baby, it's easy to neglect the needs of yourself and your marriage.