Childhood apraxia of speech (CAS) is a motor speech disorder that makes it difficult for children to speak. Children with the diagnosis of apraxia of speech generally have a good understanding of language and know what they want to say. Childhood apraxia of speech (CAS) is a motor speech disorder that makes it difficult for children to speak. Children with the diagnosis of apraxia of speech generally have a good understanding of language and know what they want to say.