It is normal for two-year-olds to be non-verbal, but it may involve sensory integration, motor and social interaction disorders and impairments, so it is usually not simple and must be assessed by a professional for the child’s overall development. If the child’s test indicators are normal and there are no hearing abnormalities, mental retardation or short tongue ties, there is no need to worry too much. Because the development of language is related to genetics, environment, exposure to things and other factors, the baby speaks late is not necessarily developmentally backward, but may also be related to genetics. The specific reasons that lead to two-year-old babies can not speak are the following: 1, genetic factors: because parents speak late in childhood, inherited to the next generation, resulting in children speak late. For this situation, do not worry too much, in daily life can often communicate with the child, exercise language skills, can gradually train, develop the child’s language skills; 2, family environment: parents’ literacy, the degree of concern for the child will affect its language development, if parents often criticize the child or too little communication with the child, the child grows up for a long time in a less linguistic environment, will affect 3. Autism: Most children with autism mainly show language impairment, usually lagging behind in language development, still unable to speak at the age of 2-3, or regressing in language after normal language development. For this situation, you should seek medical examination in time and cooperate with the doctor to treat the child.