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I. Language Development: Milestones. Birth: crying12 weeks: gurgling and cooing mostly with vowel sounds16 weeks: responds to human sounds20 weeks: now coos with consonants6 months: babbling with single syllables8 months: can use tone for emphasis/emotion10- 12 months: mamamama dadadadadada; responds to commands12 months: first words18 months: 3 - 50 words. Vocabulary spurt.24 months: two-word stage.
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