It is not normal for a 28-month-old baby not to be able to speak, and it is mostly considered to be a delayed language development caused by autism and hearing abnormality. Normal babies will unconsciously call their father or mother when they are 7~8 months old, and they can consciously call their father and mother at around 1 year old. And the baby in 1 year and a half can send out different sound words, in 18 ~ 24 months will send out 3 ~ 5 words of short sentences, most babies to 2 years old will appear language outburst period, so the baby 28 months can not speak belong to the abnormal performance. A 28-month-old baby who can’t speak may have delayed speech development due to autism, hearing abnormality, poor language environment, cerebral palsy, or diseases of the sound-forming organs. To summarize, 28 months baby can not speak is not a normal performance, parents are advised to take their children to the doctor for examination, the doctor will choose appropriate measures for the cause of treatment. In addition, parents usually need to communicate with their children more, to create a good language learning environment for the child, need to be appropriate for the child’s language training.