About 1.7 out of every 1,000 babies born in the United States have some degree of hearing loss, and the signs can be surprisingly easy to miss. Whether your child is a newborn who didn’t pass a hospital screening or a toddler who seems to ignore you, there are specific behaviors at every age that can tell you whether hearing is developing on track. Here’s what to look for and what happens if you suspect a problem.
Signs in Babies Under 6 Months
Newborns respond to sound from the very first days of life, and these reactions are your earliest window into whether hearing is working. Between birth and 3 months, a baby with typical hearing will startle or react to loud sounds, calm down or smile when spoken to, and recognize a parent’s voice. During feeding, you may notice your baby briefly pauses sucking when a new sound starts. Cooing and making soft pleasure sounds are also signs that the auditory system is developing normally.
Between 4 and 6 months, the signs become more obvious. Your baby should follow sounds with their eyes, respond to changes in your tone of voice, notice toys that make noise, and pay attention to music. Babbling starts during this window, with sounds like “ba,” “pa,” and “ma” appearing. A baby who laughs, makes gurgling sounds during play, and babbles when excited or upset is showing you that they can hear and are learning to use their voice in response.
If several of these milestones are absent, not just one on a bad day, that’s worth investigating.
Signs From 7 Months to Age 1
This is the age range when hearing-related behaviors become hard to miss. A baby with normal hearing will turn and look toward the source of a sound, listen when spoken to, and begin understanding common words like “cup,” “shoe,” or “juice.” They should respond to simple requests like “come here” and babble in longer strings of sounds (“tata,” “upup,” “bibibi”). By their first birthday, most children have at least one or two words, like “hi,” “dog,” “dada,” or “mama.”
A child who doesn’t turn toward sounds, doesn’t respond to their name, or isn’t babbling by 9 or 10 months may have hearing loss. The absence of babbling is particularly telling, because babies babble as a direct response to the sounds they hear around them.
Signs in Toddlers and Older Children
In toddlers aged 1 to 3, hearing loss most often shows up as a speech or language delay. Your child may have fewer words than expected, speak unclearly, or be difficult for others to understand. You might notice them cranking up the volume on a tablet or TV, or struggling to follow conversations, especially in noisy environments like restaurants or playgrounds.
In school-aged children, the signs can be subtle enough to mimic other conditions entirely. A child who frequently says “what?” or asks you to repeat yourself, who moves closer to the TV, or who seems inattentive in class may be dealing with hearing loss rather than a behavioral or attention issue. Teachers sometimes flag these children for possible ADHD or concentration problems when the real issue is that they can’t hear the instruction clearly. If your child’s teacher reports attention difficulties, it’s reasonable to rule out hearing loss before pursuing other explanations.
What Causes Hearing Loss in Children
Roughly 4 out of 5 children with hearing loss have a genetic cause. This doesn’t always mean a parent is deaf or hard of hearing. Many genetic forms of hearing loss are carried recessively, meaning both parents can have typical hearing and still pass it on. The remaining cases come from non-genetic factors, like certain infections during pregnancy, complications at birth, or a combination of genetic and environmental influences.
Hearing loss can also develop after birth. Repeated ear infections, certain childhood illnesses, head injuries, and exposure to very loud noise can all cause hearing loss that wasn’t present at birth. This is why a child who passed their newborn hearing screening can still develop problems later.
How Hearing Is Tested at Different Ages
Most hospitals screen newborns before discharge using one of two painless tests. The first places a tiny earphone in the baby’s ear canal and measures a faint echo that the inner ear produces in response to sound. A healthy inner ear vibrates when it receives sound, and that vibration bounces back as a signal the device can detect. The second test uses small sensors on the baby’s scalp to track how sound travels from the ear to the brainstem. Both work best when the baby is sleeping or resting quietly.
For babies 6 months to 2 years old, audiologists use visual reinforcement audiometry. The child hears a sound and is rewarded with a visual stimulus, like an animated toy lighting up, when they turn toward it. For children between 2 and 5, conditioned play audiometry turns the test into a game: the child drops a block in a bucket or puts a peg in a board each time they hear a tone. Older children can usually do standard hearing tests similar to what adults experience.
If your baby didn’t pass the initial hospital screening, that alone doesn’t confirm hearing loss. Background noise, fluid in the ear canal, or a restless baby can all cause a false result. But it does mean you should schedule a full diagnostic evaluation promptly.
The 1-3-6 Timeline
Federal health guidelines recommend a specific timeline for catching and addressing hearing loss early. Babies should be screened by 1 month of age, receive a full diagnostic evaluation by 3 months if they didn’t pass screening, and be enrolled in early intervention services by 6 months. This is known as the 1-3-6 framework.
These benchmarks exist because the first six months of life are critical for language development. Children who receive support services before 6 months of age develop significantly stronger communication and language skills than those identified later. Even a few months of delay can make a measurable difference in outcomes, so if your child didn’t pass a screening, moving quickly matters more than waiting to see if things improve on their own.
What Happens After a Diagnosis
If testing confirms hearing loss, the next step depends on the type and severity. For mild to moderate loss, hearing aids are typically fitted within one month of diagnosis. These aren’t the bulky devices you might picture. Pediatric hearing aids are small, durable, and designed to stay on active little heads. The audiologist will monitor your child’s progress month by month, looking for steady gains in speech, language, and responsiveness to sound.
For children with severe to profound hearing loss who don’t make expected progress with hearing aids, cochlear implants become an option. The FDA has approved cochlear implantation for children with profound hearing loss as young as 9 to 12 months and for severe to profound loss starting at about 2 years. The key factor isn’t just the hearing test results. If a child isn’t making month-for-month progress toward speech and language milestones despite wearing well-fitted hearing aids full time and participating in therapy, that’s the signal to evaluate whether an implant would help more.
Children with confirmed hearing loss also qualify for early intervention services under federal law. The Individuals with Disabilities Education Act guarantees access to free, appropriate support services, which can include speech therapy, sign language instruction, auditory training, and family counseling. These services are available from birth through age 3 under Part C of the law, and school-aged children continue to receive support through their local school district. You don’t need private insurance to access them.
Selective Hearing vs. Real Hearing Loss
Every parent of a toddler has wondered whether their child is ignoring them or genuinely can’t hear. A few patterns can help you tell the difference. A child with selective hearing will typically respond to sounds they care about, like a favorite show starting or a candy wrapper crinkling, while ignoring instructions they’d rather not follow. A child with hearing loss tends to miss sounds across the board, regardless of interest level.
Pay attention to consistency and context. If your child never responds when you call from another room, struggles in noisy environments, or needs to see your face to understand you, those patterns suggest hearing difficulty rather than stubbornness. When in doubt, a hearing test is quick, painless, and can be done at any age. There’s no minimum age requirement, and no downside to checking.