A 15-month-old baby who can’t speak may be caused by insufficient language stimulation, or it may be caused by autism, cerebral palsy, hearing abnormality and other diseases. The causes are different, the treatment plan is different, and you should bring your child to the pediatrician of the hospital in time. 1. Insufficient language stimulation: Children’s language development is also a kind of imitation ability, if parents and children’s language communication is relatively small, then the child’s language development will also be limited. In this case, parents should pay attention to speak to their children more often to stimulate their language development. 2. Autism: Autistic children are mainly characterized by social interaction disorders and communication disorders. Communication disorders, in turn, are characterized by verbal communication disorders, including delayed language development. Those diagnosed with autism should be treated with intervention training under the guidance of a doctor. 3. Cerebral Palsy: Also known as cerebral palsy, it is a syndrome of non-progressive brain injury caused by a variety of factors. The child may have motor dysfunction and is often accompanied by mental retardation and speech disorders. Those diagnosed with cerebral palsy should undergo rehabilitation training under the guidance of a doctor. 4. Hearing abnormality: For example, babies with congenital hearing abnormality can go to the ear, nose and throat department in time to clarify the cause of the disease for treatment. 15 months of the baby can not speak, should be timely to the hospital pediatrics. After identifying the cause, under the guidance of the doctor to take reasonable treatment program, in order to try to ensure that the child’s language development critical period.