If the baby does not speak, or even a year or more still do not speak, may be the following reasons: First, the parents did not do a good job of education, did not create a rich language communication environment for the child, the child may not learn the skills of speech, it is easy to become non-verbal, or even speech development is relatively delayed. Second, mental retardation, some children with mild or borderline mental retardation are prone to delayed speech development, especially if they are very old and still can’t learn to speak, or even can only simply say words like dad and mom, this time we must do a psychological test to see if it is a problem of mental retardation. Third, it is also possible that some children with autism may have autistic problems. Children with autism are prone to narrow interests, reluctance to communicate with others, and even intellectual development problems, such as delayed speech development. If there is a tendency to autism, it is important to go to the hospital and be examined in a timely manner. The above reasons are more common.