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Infants engage in recipricol communication with their caregivers, responding most to facial recognition and vocal cues.
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90% of language form has been acquired.
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Infants learn a signal-response sequences and predictable patterns through rituals and games.
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Infants develop intentionality through gestures accompanied by eye contact.
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The first meaningful word is expressed and sound patterns are continually being stored.
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At 18 months old, a child can produce around 50 single words and starting to combine words on the basis of word-order rules; babbling starts to decrease and new word referant associations are made in as little as three exposures.
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At 2 years old, a toddler has built a vocabulary consisting of 150-300 words and can use a greater range of grammatical structure wherein the addition of bound morphemes is at an average length of 1.6-2.2 morphemes per MLU.
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The toddler begins to express more adult like sentence structures.
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The preschooler begins to change conversation style in order to fit partner and mean length of utterance continues to increase to 3.6-4.6 morphemes.
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The child begins to learn visual communication through writing and reading.
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In early school age years, conversational language continues to develop and narratives expand and gain all of the mature features of storytelling.
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Adolecents discuss more topics that are not discussed at home and communicate with more affect and turn-taking.