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From birth to age three months, the child will recognize and respond to his mother's voice.
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At age four months, the child begins making babbling sounds.
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At age six months, the child begins laughing.
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From age eight months to one year, the child begins to imitate speech.
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At age eighteen months, the child will begin to combine words.
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At age two years, the child begins asking questions.
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At age three years, the child is able to tell stories.
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By age six years, the child has begun to read and write.
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By adolescence, the child can distinguish between different meanings of words.
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By young adulthood, the person is able to communicate correctly and understand grammar rules.
