Whether or not a speech delay can heal on its own depends on the cause. If the delay is due to a disease, it does not usually heal on its own and may affect neurological development if not treated with intervention in a timely manner. If the delay is due to an auditory disorder, it does not usually heal on its own, and the more severe the auditory disorder, the more severe the language disorder. If the delay in language development is due to mental retardation, autism, motor autism, or abnormalities of the articulatory system, it also usually does not heal on its own, and the language disorder gradually worsens with age. If the delay in language development is due to disassociation from the language environment, early attention to language and language stimulation can lead to gradual self-healing. If a delayed language development is detected early, most children can gradually achieve relative fluency through continuous training. Therefore, once a delayed speech development is detected, the child should be seen by a neurologist at a hospital in a timely manner and treated according to the specific condition.