Here is a list of things an infant with normal hearing should be able to do:

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Startles to loud sound

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Quiets to familiar voices

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Makes vowel sounds like "ohh" and "ahh"

Four Months of Age

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Looks for sound sources

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Starts babbling

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Uses a variety of voice sounds, squeals and chuckles

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Turns head toward loud sound

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Begins to imitate speech sound

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Babbles ("baba," "mama," "gaga")

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Imitates speech sounds of others

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Understands "no-no" or "bye-bye"

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Turns head toward soft sounds

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Gives toy when asked

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Responds to singing or music

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Readily turns toward all sounds

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Able to name 20 objects.

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Able to say 3-element sentences, e.g. I drink milk, I play balls, and so on.