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An infant is able to respond to voice.
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Vocalizes pleasures and displeasures
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Uses words meaningfully
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Forms 2 word questions and says 2-8 words
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Able to imitate words and sounds more precisely
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Able to make two and three word sentences that can be understood.
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Can form sentences of an average of 6-9 words.
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Able to keep a conversation going without repeating sounds or words most of the time.
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Use of future, present, and past tenses.
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Use adult-like grammar in sentences and conversations