The difference between speech and language delay and autism is that speech and language delay manifests itself as abnormalities in language comprehension and expression, and is associated with mental retardation, hearing impairment, and psychiatric disorders. Autism, on the other hand, is mostly genetically related and is accompanied by social interaction deficits with restricted repetitive behaviors in addition to verbal communication deficits. 1. Delayed language development is closely related to mental illness, neurological damage, intellectual disability, hearing impairment, etc., such as autism and cerebral palsy, which can affect language impairment. It is manifested as abnormalities in expression and comprehension of language, which can be categorized as follows according to different clinical manifestations: (1) Dysarthria, in which the child is of normal intelligence and has difficulty in pronouncing words, making it difficult for others to understand what he or she says. (2) Expressive language disorder, in which the child’s comprehension is normal, the language is not logical, and the expression utters complete sentences. (3) Receptive language disorder, in which there are problems with both speech and articulation, and the child is unable to understand what others are saying. (4) Acquired epileptic aphasia, a neurological disorder in which there is a sudden loss of speech with epilepsy. 2. Autism is predominantly genetic, and the language communication disorder is characterized by abnormalities in language form and content, delayed language development, impaired comprehension, abnormal speed of speech, and partial loss of language function. The child lacks response to calls, avoids the gaze of others, and has repetitive and stereotyped behaviors, some of which include impulsive aggression and self-deprecating laughter.