When a normal baby is born, its outer ear, middle ear and inner ear cochlea have been formed, that is to say, the baby is born with hearing.
In addition, the auditory center of the brain can be divided into the first level, the second level and the third level. Among them, the first and second level brain auditory centers are located near the temporal lobe area of the cerebral cortex, which have been developed at birth, but the third level brain auditory center is about three years old after birth, which is stimulated by the sound in the acquired environment continuously. On the other hand, after three years old, the plasticity of brain gradually becomes worse. Therefore, if a child with congenital hearing impairment can be diagnosed and rehabilitated as soon as possible with hearing aid, his third level brain sensory center will develop. Otherwise, when it is treated too late, the effect will be naturally bad, and the ability to develop normal listening and speaking will not reach the ideal level easily.
Therefore, if children with hearing impairment can get early diagnosis, proper treatment and rehabilitation, it is possible to improve their language learning and ability to communicate with others, and their interaction with their parents and families will be improved. After entering the school, the situation of receiving education will be more normal. Only entering the society in the future can we become a healthy and independent person.
It is possible to assess hearing problems by observing infants’ behaviors, but it is not expected that each child will respond consistently to sound. Sometimes children don’t pay attention to the loud sound because there are other things that are more interested in attracting them. The exact age of learning new things often varies from person to person, so the speed of learning is not the only or certain basis for judging hearing impairment.
1. When the baby grows up, he will start to learn the daily speech and the voice in the environment, but he will not judge the source of the voice until six months later.
2. Don’t believe that you have the absolute ability to assess the hearing status of a child. If you have doubts, you should consult an expert and ask him to have a hearing test.
| From birth to two months | Two to six months | Seven to twelve months | One to two years old |
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★ loud voice (such as clapping hands or closing door) will make him have some reactions (such as blinking eyes) or scares
★ interested in or disgusted with various sounds in the environment (such as the sound of vacuum cleaner)
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★ when you hear your voice, even if you can’t see it, there will be different reactions or expressions.
★ show interest in some sounds in the environment (such as: door entry sound, dog barking, TV sound, etc.)
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★ start to pay attention to the source of sound
★ start learning YY, such as Ma
BA. Da likes to talk to you.
★ you can understand the meaning of your name and “don’t” and “Bye”-
By E.
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★ can understand simple words
★ you can understand the instructions of your parents (for example, go to the table to get a pacifier)
★ can say some simple words
(for example: brother, bath, no need)
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There is no hearing test that can completely measure the hearing impairment of infants and young children. Even if he passes some tests, it does not mean that there is no problem in his hearing. If you have any problems at any time, be sure to reevaluate them so as not to delay the time of treatment and rehabilitation.
The hearing test of infants can be divided into two types: subjective (determined by the observation of the examiner) and objective (determined by the record of the instrument).
I. subjective hearing test
1) visual reinforcement audiometry
2) play audiometry (conditioning audiometry)
2. There are three main objective hearing tests (no cooperation with children, as long as they do not move or sleep)
1) impedance audiometry, including tympanogram and stapes reflex
2) otoacoustic emissions (check inner ear function)
3) auditory brainstem response
Link：How to find and diagnose hearing impairment in early stage
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That’s a good point that all children learn and develop at different ages. I have noticed that my 2-year-old son doesn’t respond or look at us when we call him or say his name. I think I will have his hearing checked to see what the source of this behavior is. http://pehratek.com/vra-testing.php