In 40% of cases hearing loss can be due to genetics. Prematurity, Low Birthweight, neonatal jaundice and birth complications such as asphyxia (lack of oxygen) can put your newborn at risk for hearing loss. Infections in the mother during pregnancy such as rubella and cytomegalovirus can also cause hearing loss to be present at birth.
As soon as 24 hours after birth, Newborn Hearing screening can be performed on your little one. This is usually done while baby is sleeping and results are not dependent on your baby’s response to the sound at all. This test involves a tiny little probe inserted in your baby’s ear, soft sounds are played into the earcanal and the response is measured. This response indicates to your audiologist whether the tiny little haircells in the hearing organ (cochlea) is working well. This test will detect the vast majority of congenital hearing losses (Hearing loss present at birth). An additional test is also available – the Automated Auditory Brainstem Response test (AABR). This test is also conducted by playing sound into the baby’s ears and measuring the response of the auditory nerve to sound waves.
New parents often experience peace of mind after this initial hearing screening to the extent that they often overlook some tell-tale signs of acquired hearing loss in the early years.
I would like to urge you to never assume that all is well with your child’s hearing since many factors can influence your child’s’ hearing in the years after birth. These factors can influence hearing temporarily or permanently –those that are temporary is by far more common, but by no means less devastating and without consequences for your child.
The production of earwax in the ear canal is a perfectly normal process, since it serves the following role: Lubrication of the ear, protecting against insects, bacteria, fungi and water. It sometimes do happen that wax build up to form a plug and can cause a blockage in the ear canal causing a temporary hearing loss. Do not attempt to remove this wax yourself – consult a trained medical professional.
A very common occurrence in infants and toddlers are the build-up of fluid/mucus behind the eardrum which causes soundwaves to not move through the ear mechanism as well as it should and preventing the child from hearing what he/she should. This is very frequently missed due to lack of ‘symptoms’. The child might also still be able to ‘hear’ to a certain extent (muffled or as if under water) and therefore parents might not be concerned. This condition is commonly referred to as ‘glue ear’ and often goes undetected for very long periods of time.
Who is more likely to develop glue ear?
Although the majority of children do not have any signs / symptoms of glue ear, symptoms to look out for includes the following:
A trained medical professional can do a visual inspection of the ear canal and eardrum with an otoscope – this can often be seen with the eye. It is however important to know that in many cases this can be missed by simply looking at the eardrum. A quick test – tympanometry can be performed by your audiologist to determine whether there is any fluid-build-up or pressure in the middle ear and is by far the more accurate option of the two.
Treatment usually involves the surgical insertion of grommets or ventilation tubes in the eardrum to assist in the draining of fluid. In some cases the Ear Nose and Throat Surgeon will advise on a more conservative treatment first.
Permanent acquired childhood hearing loss can occur due to the following reasons amongst others:
Measles, Mumps, whooping cough, Meningitis, Unknown viral infections (often simply presenting like a common cold), Noise exposure, Ototoxic medications.
In some cases these illnesses will only affect one ear, and can easily be missed since your child will still seem to hear well. I would recommend that whenever your child had one of the abovementioned illnesses or infections that he/she is closely monitored and brought in to the audiologist for a hearing test or screening to ensure that hearing has not been affected. Parents should also ensure that children are not exposed to loud sounds and whenever your child had a major hospitalisation, be informed about which medications was administered – especially IV medication and IV antibiotics since these could potentially be ototoxic.
Developmental milestones as well as behaviour can often be a tell-tale sign that hearing should be looked at. Here are some guidelines for communication, speech & language development in the first 2 years of life.
Startle at loud sounds
Wake up or stir at loud noises
Respond to your voice by smiling or cooing or quieting
Calm down at a familiar voice
Cry differently for different needs
Notice toys that make sounds
Understand hand motions like the bye-bye wave
Make gurgling sounds when playing with you or left alone
Babble and make a variety of sounds
Use his or her voice to express pleasure and displeasure
Move his or her eyes in the direction of sounds
Respond to changes in the tone of your voice
Pay attention to music
Make various babbling sounds
Repeat some simple sounds
Understand basic requests
Use its voice to get your attention
Respond to name
Try imitating speech sounds
Say a few words, such as “dada,” “mama” and “uh-oh”
Understand simple instructions, such as “Come here”
Recognize words for common items, such as “shoe”
Use many simple words
Point to body parts when you ask
Name common objects
Listen with interests to songs, rhymes and stories
Point to familiar objects you name
Follow basic commands
Recognize names of familiar people, objects and body parts
Follow simple directions accompanied by gestures
Say as many as 10 words
Use simple phrases, such as “more milk”
Ask one- to two-word questions, such as “Go bye-bye?”
Follow simple commands and understand simple questions
Speak about 50 or more words
Speak well enough to be understood at least half the time by you or other primary caregivers
Has difficulty understanding what people are saying.
Speaks differently than other children her or his age.
Doesn’t reply when you call his or her name.
Responds inappropriately to questions (misunderstands).
Turns up the TV volume incredibly high or sits very close to the TV to hear.
Has problems academically, especially if they weren’t present before.
Has speech or language delays or problems articulating things.
Watches others in order to imitate their actions, at home or in school.
Complains of ear pain, earaches or noises.
Cannot understand over the phone or switches ears frequently while talking on the phone.
Says “what?” or “huh?” several times a day.
Watches a speaker’s face very intently – many children’s hearing loss escapes detection because they are very successful lip readers.
With children we would rather want to be sure and not put something down to something being ‘selective hearing’ while there might be something else that needs looking at. Have you heard of ‘auditory processing’?
Auditory Processing is the process of taking in sound through the ear and it travelling to the language area of the brain to be interpreted. To have a delay or difficulty in this process is called an auditory processing disorder or “delay.” This deficit is present despite having normal hearing. This typically presents as a child that is having difficulty in hearing in noisy environments, difficulty remembering tasks that was heard. A person’s first assumption is that the child has a hearing problem. Consult your audiologist for further assessment of auditory processing skills.
In conclusion – despite the fact that your auntie or granny says “so and so only started speaking when they were 5 – just wait, when they start speaking you won’t be able to stop them” – there might be some merit in monitoring your child’s hearing since there are many aspects possibly influencing hearing and consequently speech & language development and possibly auditory processing ability.