

Your Child’s Hearing
Hearing is an essential part of development as it enables babies to take in information about the world around them. It stimulates brain development and is critical for language development. For this reason, it is vital to identify and address hearing difficulties as early as possible. By the 16th week of pregnancy, the tiny bones in the baby’s ears begin to develop. By the 20th week of pregnancy, the baby begins to respond to sounds. Loud sounds may even make the baby startle or move about. By the 25th week of pregnancy, the auditory system becomes fully functional. At this point the baby is able to hear your voice when you are speaking or singing. Studies have shown that after birth, babies are able to recognize songs that were sung to them while in the womb. Unlike the visual system where actual visual experience begins after birth, the auditory system requires auditory experience with voice and language, music and meaningful environmental sounds during the last 10 to 12 weeks of fetal life. A child is born with a mind that is open and ready to receive information through all five senses. The more information the mind receives, the better the child is able to understand and participate in the world around them. All five senses are tools for learning and communicating. However, the sense of hearing is the most critical for speech and language development. It is difficult to define “normal” hearing development when speaking about human beings as each individual develops in their own way and at their own pace. However, over the years, several researchers have been able to compile a guideline for general milestones for hearing development: A Guideline for Hearing Developmental Milestones Birth At birth, babies are able to exhibit a startle reflex in response to sudden loud noises. This means that they will stiffen, quiver, blink, fan out their fingers and toes, or cry as a response. They are often sensitive to a wide range of sounds, including intonation and rhythmic cues. At birth, babies are able to recognize their mother’s voice and often prefer the sound of their mother’s voice. Sounds of different pitches have different effects on the infant. Low frequency sounds and rhythmic sounds have a calming effect. Higher frequency sounds result in a more violent reaction. You may note an increase or decrease in sucking in response to sound. Three Months At three months of age, babies are more aware of human speech and will begin to attend to voices. They will also start to show excitement for familiar sounds such as approaching footsteps, running bath water, etc. At this age, babies tend to awaken or quiet to the sound of their mother’s voice and will vocally respond to their mother’s voice. They begin to imitate noises as they hear them e.g. ooh, baba. Most importantly, at this stage, babies begin to localize sound by means of turning their eyes toward the general sound source. This is a great time to introduce sound-making toys; as they begin to enjoy such sounds and will listen to bells and other sound-making toys near them. Four Months By four months of age babies start localizing sound by turning their head toward the general source of sound and they will actively search for human voices. Five Months At 5 months of age, babies are able to localize sound more specifically. They distinguish between friendly and angry voices and react appropriately. They will stop crying or coo is response to music and become very interested in human voices. At this point, they are able to discriminate between sounds of strangers and familiar people. Six Months By 6 months of age, babies specifically locate sound from any direction, such as the bell that is rung out of sight (downward localization develops before upward localization). They will respond to human speech by smiling or vocalizing and will turn immediately to their mother’s voice across the room. They may show evidence of response to different emotional tones in their mother’s voice. Their association of hearing with sound production is now evident, in that they repeat selected sounds that they have heard. Eight Months At 8 months of age it is expected for the baby to turn his head and shoulders toward familiar sounds, even when he cannot see what is happening. They begin to understand sounds and words in context e.g. responding to a telephone ringing, a human voice, his own name, “no-no,” “bye-bye“. It is at this point that they begin to enjoy games like pat-a-cake and peek-a-boo. They may respond with raised arms when their mother says, “Come up” and reaches toward the child. One Year At one year of age it is expected that the child will babble in response to human voice. His sound imitations indicate that he can hear the sounds and match them with his own sound production. He will enjoy various sounds like jingles and rhymes and show interest in environmental sounds that may even be beyond his immediate surroundings. The child will respond to simple commands (at first, only when the command is accompanied by a gesture), such as giving a toy on request or going somewhere as directed. At this age, it is expected that the child understands an assortment of action words (verbs) such as “drink“, “go“, “come“, “give“, as well as some simple directions such as “wave bye bye.” No real understanding of questions is shown at this point. Two Years By two years of age several hearing and communication skills have developed: Shows interest in the sounds of radio or TV commercials. Listens to reason of language. Listens to simple stories. Responds to command, “Show me the —.” Understands and answers simple “wh” questions, e.g. “Where is your –?” Responds to yes/no questions by shaking or nodding head. Waits in response to “just a minute.” Identifies five body parts. Understands family names by selecting appropriate pictures. Understands the phrase, “have sweets after lunch” Carries out 4