What are the reasons a two-year-old child is not talking?

Possible reasons why a two-year-old child may not be speaking include delayed language development, intellectual disability, autism spectrum disorder (autism), specific language impairment, abnormalities in speech organs, and poor language environment. Additionally, factors such as genetics, premature birth, ear diseases, or abnormal auditory nerve development may also affect the child's language development. If a child continues to not speak, prompt medical evaluation is recommended.