A child who is still unable to speak at the age of two is usually considered an abnormal presentation. It is normal for a two-year-old child to be able to produce two-syllable words or have an increased vocabulary, to be able to communicate in simple language, and to be able to simply state his or her wishes. A child who is two years old and does not speak may be due to pathologic factors, such as central nervous system damage, cleft lip and palate, and hearing impairment, all of which can lead to delayed language development. It may also be due to genetic factors, such as mental retardation, inborn genetic metabolic diseases or chromosomal disorders. In addition, there are also environmental factors such as autism or excessive parental care, resulting in the child not needing to communicate verbally to meet the needs of the long-term lack of verbal stimulation, will lead to the child increasingly do not want to speak. It is recommended to take the child to the rehabilitation department or child health department, after a systematic examination, the cause will be diagnosed by experts, and then targeted treatment will be carried out.