After an illness during pregnancy deafened Doug and Naomi Foley’s baby, they got a call from a friend of the family who had a deaf and blind son. Her emphatic message: Learn American Sign Language.

Sign language is a language you express by using your hands and face instead of spoken words. It’s most commonly used by people in the Deaf community. How many types of sign language are there? There ...

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A recent study published in the journal Infancy found that babies’ ability to match speech to faces predicted their future language abilities. The study followed 103 children from age three months to ...

AS WITH spoken languages, there is no “universal” sign language. Different countries have their own versions, which are related to local cultural and religious backgrounds. For example, American Sign ...