Good hearing is extremely important for the development of a child's language, the perception and cognition of the world. Therefore, it is important baby‘s hearing impairments to identify as early as possible. Parents' attentiveness and diligence have high value and can help to assess whether or not the baby‘s hearing is really good.
Child’s hearing development right after birth:
Right after birth
From birth, your baby has pay close attention to sounds, especially high-pitched ones (for example: when he hears two hands clapping or banging or knocking on doors; in response to such sounds, the baby should blink or open eyes wide open.
About 1 month
The baby should start responding to sudden, prolonged sounds like the noise of a vacuum cleaner.
About 4 months
From four months your baby will react excitedly to sounds, and he may smile when he hears your voice and calms down, even he can’t see you. The baby can turn his head or eyes towards you, if you come from him back and talk.
About 7 months
At seven months babies will realize where sounds come from, and should immediately turn to the sound of your voice. He is able to react to the silent sounds coming from both sides.
About 9 months
The baby should listen to the usual everyday sounds and search where the silent sound has come from. He also has to show satisfaction with loud and melodious whispers.
About 12 months
The baby should respond when his or her name is called, or he heard other common words. He should respond to “no”, “bye bye”, even if he does not see gesticulation and mimes.
About 18 months
By 18 months, the baby should understand simple phrases, identify mentioned objects and recognizes people. At the same time, 18-month old should have a spoken vocabulary of between 20-50 words and short phrases. The vocabulary is expanding.
About 24 months
By 24 months, a toddler’s spoken vocabulary should be 200-300 words coupled with the emergence of simple and short sentences. Other people have to understand the child's language. A toddler should be able to sit and listen to read-aloud storybooks.