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At birth a baby has the ability to cry, which is a sound that has no controlled communicative power.
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The first vocal responses when spoken to begin.
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The child begins gesturing as a way to communicate what they want or need.
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This is when the first words are spoken replacing previous gestures.
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The rules of language begin to form in the toddler's utterances.
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The toddler begins using bound morphemes in one to two word utterances.
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The toddler uses more adult like langauges with utterances being three or more words on average.
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This is the beginning of conversational speaking.
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The child has learned most of the language form in which they were raised.
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This age ushers in reading and writing as communication forms.
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This is the point at which conversation participation is complete, they are able to tell narratives, knows more than one meaning to a word including figurative language, and uses gender syle when talking.