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At three months babies already respond vocally to their parents by crying.
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Begins gesturing
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First words are spoken
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Begins combining words on the basis of word-order rules.
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Begins adding bound morphemes. Average MLU is 1.6 - 2.2 morphemes.
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More adult like sentence structure.
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Begins to change style of talking to fit conversational partner. MLU is 3.6 - 4.7 morphemes.
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Ninety percent of language form learned.
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Begins to learn visual mode of communcation with writing and reading.
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Ability to participate competently in conversations and telling of narratives