Recently, there are several mothers with children to the clinic, said the child has been 2 years old, why still can not speak, generally speaking, this to 2 years old still can not speak the vast majority of children is due to deafness, and this deafness is mostly for the pre-language deafness or pre-school age loss of hearing caused by. Normal children born at full term have hearing, but the response to sound at the subcortical level, 60-90 decibels only cause respiratory changes. 3 months turn their heads to look for the source of the sound, 4 months pleasant smile and can make cooing sounds, 6 months to respond to the mother’s voice, 7 months can make lip sounds mom and dad, 8 months can distinguish the meaning of the voice, 9 months can look for different heights of the sound source. 1 year of age. At 1 week of age, the child can speak simple words and understand his/her own name; at 2 weeks of age, the child can understand a few simple commands and speak 2-3 word phrases; at 4 weeks of age, the auditory development is basically complete. 5 years of age is an important period for the formation of speech and memory cells, and the loss of the opportunity for language training due to poor hearing or other factors is difficult to make up for in the whole life. If the child has reached the age of 2 years and still can not speak, this generally indicates that the child’s auditory development has been affected by adverse factors, it is necessary to consider whether the mother is pregnant with rubella and viral infections, syphilis, endocrine diseases, or suffering from endemic goiter and cretinism, or use of ototoxic drugs and consanguineous marriages, etc., and to consider the birth of the child is sick with ototoxic drugs (gentamicin, streptomycin, quinine, kanamycin, etc.) or suffering from ototoxic drugs, etc., or to consider the birth of the child with ototoxic drugs. It is also important to consider whether the pediatric patient was born with ototoxic drugs (gentamicin, streptomycin, quinine, kanamycin, etc.) or suffered from acute infectious diseases such as epidemic encephalitis, meningitis, mumps, or pediatric mental retardation, or head trauma, including birth and postnatal trauma. In short, a variety of factors can cause abnormal auditory development in children to form deafness, and most of this deafness is moderate or severe sensorineural deafness, so in this case, children often can not hear the stimulation of the external language sound, but also can not detect their own sound, so most of them are both deaf and mute. In addition to this, developmental delay can also cause the child to be unable to speak at the age of 1-2 years, but this is rare. Therefore, children who cannot speak at the age of 2 should be educated as deaf. There is no definite and effective treatment for pediatric deafness, only hearing aids or cochlear implants and language training. Therefore, early detection and education of deaf children may be able to utilize and develop children’s residual hearing, so that children get partial hearing or deaf but not mute. Therefore, if you find that your child does not wake up easily during sleep, does not respond to sudden strong sounds behind his back, or cannot hear the teacher’s words clearly even if he sits in the front row of the class, parents should bring their children to the hospital as soon as possible to avoid delaying the time of treatment.