The baby is three years old and still can not speak this is not normal, may be associated with personality introversion, hearing impairment, developmental delay, etc.; can communicate with the baby more, go to the hospital to do intelligence testing, if necessary, surgical treatment. 1. Personality introversion: you can talk to your baby more often, take him to crowded places, or participate in language training courses. 2. Hearing impairment: the functions of hearing and speaking are together, when there is a hearing impairment, it may lead to the inability to speak; in this case, you should go to the hospital to find out the cause of the hearing impairment, and then restore the hearing through surgery. 3. Developmental delay: speech delay, autism spectrum disorders and other mental disorders may cause babies not to speak; in this case, you should go to the hospital for language and other tests, and early intervention and treatment. Before the baby is five years old is the golden period of brain development, if there is an abnormality, then it may affect its whole life; the baby will not speak at the age of three years old, it should pay attention to, early medical treatment, so as not to delay the condition.