Infant stimulation activities for hearing are fun; they are exciting and hold a lot of entertainment for you and your baby. As your baby reacts to a sound, then looks around for it, and is ultimately rewarded with your encouragement and smiling face you will find that you are having as much fun as your baby.
Using a rattle gently shake it in front of your baby and allow her to see the object that makes the sound. Then shake it off to one side and see if she looks in that direction. Try it again. Then try it on the other side. How about standing behind her to see what her reaction is. Eventually you will see your baby begin to focus her hearing to find where the object is. Then reward her with a big smile, then ultimately the final cuddle!