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Folven, Raymond J.; Bonvillian, John D. – Developmental Psychology, 1991
Home visits and parental diaries revealed that children of deaf parents produced their initial recognizable sign at 8.2 months of age, attained a lexicon of 10 signs at 13.5 months, and combined signs at 16.1 months. Children did not use signs to name new things until 12.6 months, typically after they had demonstrated communicative pointing. (BC)
Descriptors: American Sign Language, Infant Behavior, Infants, Language Acquisition