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Baby looks for place where familiar voice comes from, also coos and chuckles.
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Baby begins gesturing towards things they want or need.
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Begins recreating sounds that others may consider to be close to first words
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Baby/Toddler begins to use ritual words like hi, bye, thank you.
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Toddler begins to use language in imaginative ways.
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Child can change style of talking to fit conversations.
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Child knows almost all of language.
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Child will begin learning to read and write, the visual part of language.
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Children are able to competently engage in conversations and understands multiple word meanings.
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By this time, teenagers have a well developed lexicon and are able to read, write, use technology and communicate with other people in adult conversations.