If the child still can’t call his father and mother when he is one and a half years old, he has delayed speech development, which is an abnormal phenomenon and needs to go to the hospital in time for medical treatment. The development of language requires normal functioning of the sense of hearing, articulation organs and the brain, and abnormal development of any of the three will affect the child’s language development. Therefore, auditory examination should be conducted to determine whether there is hearing impairment, short tongue tie or other oral developmental abnormalities, as well as cerebral atrophy, damage to the speech center, etc. Cranial nuclear magnetic and other related examinations, as well as autism scale tests are required. In conclusion, if the child is still unable to speak at the age of one and a half, it is necessary to go to the hospital in time for the necessary diagnosis of the cause of the disease and the corresponding rehabilitation treatment.