At 12 months, many babies are beginning to say their first words. By this age, simultaneous activity in both the speaking and listening areas of the brain is even stronger. This coordinated brain activity is the result of both biology and experience. As infants hear more and more language, the connections, and the degree of coordination between these two brain areas grow. Early experiences with language are especially critical for infants. The infant brain is beginning to connect and coordinate these regions long before they utter their first word.