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From birth to 3 and 4 months, infants are actively learning their caregivers reciprocal relationship with limited communication such as babbling, crying, and smiles.
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From 5-8 months, infants begin to interact with others by gesturing.
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At approximately 11-12 months of age, a child speak their first word with partial understanding of the word.
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At 18 months a child is able to speak about 50 words and they slowly begin to form short sentences.
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Communication is developed into reading and writing and language is more complex.
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Language development during adolescence becomes very sophisticated. By now, children are completely aware of the rules of langugage context.
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A child begins to use sarcasm and also uses more slang.
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Has the ability to maintain a more intellectual conversation and their vocabulary is constantly increasing. (Approx. 5-10 words weekly)
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First language has been completely mastered and an individual could have learned or is learning a second language at this point.