By holding a baby, talking to a baby, caressing a baby, and loving a baby we are wiring her brain. Think of it in terms of the telephone and electrical wires coming into your home. Some of those wires have a heavier wrapping on them because they carry more electrical current. This is like the brain. The heavy wires in the brain are the axons with a myelin coating.
Repetition creates that coating, or myelin sheath, in infants.
All those dendrites and axons want some more of that good cheek loving stuff to release endorphins. These are the chemicals that our body sends to the brain when we are enjoying something like cheek rubbing, lullabies and Mozart. When the parent or caregiver gives a baby attention, love and proper care the brain responds and strengthens its connections.