Three-year-old babies can not speak due to hearing impairment, developmental delay, autism and other factors, you need to take your child to the hospital in a timely manner to check, identify the causes, the right treatment, the symptoms can be relieved. 1. Hearing impairment: hearing impairment can cause three-year-old babies do not speak, mild hearing impairment can use hearing aids, severe impairment need to implant cochlear implants to help restore hearing and then strengthen the language training, and gradually train the child’s ability to express their language. 2. Autism: Autism usually shows symptoms such as language development disorder, social interaction disorder, stereotyped behavior, narrow interest, etc. It is mainly intervened through education and training, such as structured education therapy, behavioral analysis therapy, sensory-motor integration training, etc. Parents should strengthen communication with their children and guide them to talk more. 3. Developmental delay: children’s growth and developmental delay can be accompanied by the symptoms of backward language development, thus appearing three-year-old baby can not speak, developmental delay may be due to malnutrition, through a balanced diet, strengthen the nutrition can be alleviated. Growth retardation may also be caused by growth hormone deficiency, hypothyroidism, etc. It is necessary to consult a doctor to identify the cause and actively treat the primary disease in order to alleviate the symptoms. Parents should take their children to the hospital as soon as possible to find out the cause and actively cooperate with the doctor’s treatment.