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The baby coos and babbles
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Pays attention and imitates sounds
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Begins gesturing
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Beginning to understand words, and can say "mama" and "dada"
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Says several single words
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Preschooler carries on a longer abstract and complex conversation, have basic concept of grammar
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Says sentences with 2 to 4 words
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Talks freely, uses clear and complete sentences, and transitioning from learning to read to read to learn
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Converse more socially
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At this period grammatical and vocabulary are advanced. They are able to use complex sentences, in both their oral statements and written language.