Research studies report that 100% of  KAT6A and KAT6B individuals have speech and language delays. Yet, there’s a wide range in language ability in this group. Some children are nonspeaking and communicate through signs, body language or AAC (augmentative and alternative communication) techniques. Others are verbal teens and adults despite language delays as young children. Many parents report that their children have markedly better receptive language than expressive language.

For more information on speech development in KAT6A, refer to the  Fact Sheet: Speech, Language and Communication in KAT6A Syndrome – September 2023