Sense of Hearing
Baby's hearing is well developed at birth, but he prefers high-pitched voices, like Mom's, because he hears them best. That's why the baby talk most people use is also music to his ears. Over the first year your child's hearing will sharpen and he'll learn to track sounds. For the first three months, he'll only turn toward a sound that's in front of him, but by 6 to 12 months he'll look toward a noise coming from behind him or from across the room.