In their first three years of life, babies face the most complex learning endeavor they will ever undertake as human beings: They learn to talk. Now, as researchers make new forays into the mystery of the development of the human brain, Golinkoff and Hirsh-Pasek, both developmental psychologists and language experts, offer parents a powerfully insightful guidebook to how infants -- even while in the womb -- begin to learn language. Along the way,...