The child is three years old and still can’t speak: first, to find out whether the baby has congenital hearing impairment, you can give the child a hearing test. Second, to see if the baby can pronounce correctly, if the tongue tie is not too short, to see if there is any problem in the oral cavity itself. Third, to see if the brain intelligence is similar to that of children of the same age, if the child itself has congenital mental retardation, and is not able to hear and understand the content of other people’s language, it will affect the development of language. If the child’s hearing and intelligence are good, but his language development is slow, but he can understand and pronounce the words, then we need to do more language communication and practice with him, and it is better to listen to more children’s songs and rhymes, and keep communicating to improve the environment for language expression.