<p>While 13-month-old babies listen and understand with both cerebral hemispheres, but by 20 months the language center of the brain has begun to shift to the left hemisphere, where the majority of adult process primary auditory information (Wernicke’s and Broca’s areas). The brain will begin to specialize in languages that it knows best, and this language will trigger the left hemisphere. Foreign languages will still access the right hemisphere (one of the reasons introducing multiple languages to your child is beneficial to their neurological development).<br></p>