What can be said about babbling if infants who are learning sign language show evidence of manual babbling (using sign-language-based babbling),but other infants show only vocal babbling

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The fact that infants who are learning sign language engage in manual babbling suggests that the process of language acquisition is not limited to vocal speech. This supports the idea that language development is a more general process that involves various motor and cognitive abilities, rather than being exclusively tied to vocal production.

What Can Be Said About Babbling If Infants Who Are