Generally, normal children will take the initiative to say “Dad, Mom” at about one year old, but some babies still do not speak after 1.5 years old, is this normal? Is this normal? Is it the “late speech of a precious person” as the saying goes? What is the reason why children do not speak? If a child is still unable to call out to mommy and daddy after 1.5 years old, we believe from a medical point of view that there is a delay in language development. First, the first thing that needs to be ruled out is whether the child has a hearing impairment, language learning must take auditory input as a template, if you can not hear the sound or inaudible will affect the normal development of language, so for children with delayed language development should pay special attention to their hearing responsiveness, can be given in a quiet room behind the child’s back sound stimulation, see if the child has a response, such as no response or response is significantly delayed, should be highly alert to the possibility of hearing impairment. If the child does not respond or the response is obviously slow, the child should be highly alert to the possibility of hearing impairment, and need to go to the hospital for professional hearing test examination. Secondly, we need to understand the child’s intellectual development, language is the external expression of intellectual development, if intellectual development is buried in the soil of the root, language is growing outside the seedlings, only the child with normal intellectual development, language development can be guaranteed. Intellectual development can be understood by observing the child’s imitation and hand operation, such as 1.5 years old child should be able to thumb and forefinger pinch to take things, will imitate wearing a hat and shoes, if all the responses are sluggish, it is recommended to go to the hospital for special intelligence assessment test. Language is a tool used for communication, and if there is an obvious communication disorder, the child’s language development is often affected. There is a special category of children who do what they want, who do not shout, who do not stop shouting, who are fascinated by toys and objects, but do not pay attention to the behavior of others, and who lack eye contact with others. If these symptoms are present, it is recommended that the child be seen by a specialist in time to consider the possibility of autism spectrum disorder. Fourth, other reasons need to be considered such as the environment and the way of bringing up the child. If parents leave their children alone and lack interaction with others, the lack of a normal learning environment for language may affect the child’s language development; in addition, if parents pay too much attention to their children and meet their children’s every need in a timely manner by reading their children’s body language, the children will not be inclined to speak actively even if they can communicate without verbal expression. In both cases, it is recommended that parents first change the way they bring up their children and strengthen their children’s language training under the guidance of professionals. In conclusion, if a child does not speak at the right age, it may be due to one or more reasons. Parents must pay attention to this and take their child to a professional institution in time for professional assessment and training guidance to ensure normal development.