Startles, or jumps when there is a sudden loud sound

 Stirs, wakes up or cries when someone talks or makes a noise

 Recognizes your voice and quiets when you speak

 Turns eyes towards interesting sound

 Appears to listen

 Awakes easily to sounds

 Turns head toward soft sounds

 Understands "no" and "bye-bye"

 Says first words such as "Da-Da," "Ma-Ma," or "Bye-Bye"