Children’s failure to speak may be caused by personality reasons, hearing impairment, autism and other reasons. 1. Character reasons: As children are more introverted, they are prone to low self-esteem, anxiety and nervousness, so they are reluctant to speak, especially reluctant to take the initiative to communicate with strangers. Generally, the mental state is not abnormal and is not accompanied by other uncomfortable symptoms. 2. Hearing impairment: children with hearing impairment are also prone to not speaking, mainly because they are unable to hear the sound of speech in their daily lives, so they have no way to express themselves. 3. Autism: autism is also called autism, many children with autism will be accompanied by communication disorders, so there will be a lack of speech, which is one of the most important symptoms of autism. Children do not speak, parents should take their children to the regular hospital in a timely manner, to identify the cause of the disease, under the guidance of professional doctors to take targeted treatment.