One of a three-part series on psychological and motor skill advancements in infants from birth to 18 months. This segment explores how babies learn to recognize spoken language. Why do babies, from their very first day of birth, prefer the sound of another human's voice over every other sound? Is language learned in the womb? How can infants distinguish sounds of other languages from their own native tongue? Why does this process stop after 10 months? Explores a baby's linguistic journey, from cooing to "motherese" during the initial months, and on to the "language explosion" after the first year. Uses current research from Dr. Andrew Meltzoff and other psychologists specializing in infant communication.