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7 to 11 months ~ change from universal linguist to language specific listener
8 to 12 months ~ uses gestures
13 months ~ first word spoken
18 months ~ vocabulary spurt starts
18 to 24 months ~ uses two word utterances

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birth ~ crying
2 to 4 months ~ cooing begins
5 months ~ understands first word
6 months ~ babbling begins

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appropriate use of language in different contexts

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study of meaning involved with word formation

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sound system of sounds of the language

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logic concerned with meaning of words and sentences

# data[].attributes.body
the acceptable way words, phrases, and sentences come together for easy understanding