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Parents and adults tend to shape word meaning in children before they shape grammar (Baron,1992;Brown,Cazden,&Bellus,1969,as
cited in Shaffer,et.al,2002).
Both infants who
are deaf and infants who can hear babble.
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The babbling of deaf infants matches the rhythms of sign language and is similar in pattern to the babbling
of hearing babies. (Petitto, Holowka, Sergio,Levy,& Ostry, 2004).
Deaf children who are not exposed to formal sign language (ASL) develop home sign,which has
structures that are simmilar to the American Sign Language ( Goldin-Meadow,Mylander,&Butcher,1995,as cited in Siegler,&Alibal,2005).
By first grade most children
understand about 10,000 words (Anglin.1993,as cited in Siegler,&Akibali,2005).
By fifth grade children
understand about 40,000 words ( Anglin,1993,as cited inSiegler,&Alibali,2005).
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