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Infants start cooing and making vowel sounds.
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Toddler will say their first recognizable word. Their babbling sounds will include the intonation patterns of the child's language community.
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Baby's vocabulary expands from 50 words up to 250 words.
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Toddlers start to combine 2 or more words to form sentences.
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Child is building vocabulary during these years. They will know the meaning of 10,000 words, be able to speak in elaborate sentences, and are skilled conversationalists.