Hard-to-Understand Speech at Age Three

How much of a child’s speech a listener understands depends partly on how well the listener knows the way the child talks, so a parent may follow a 3-year-old easily while strangers miss words. The American Speech-Language-Hearing Association’s milestones for 2 to 3 years note that speech is becoming clearer but may not be understandable to unfamiliar listeners.

What you’ll learn

• Why a parent understands more than a stranger does
• What one large study of strangers listening to children found
• How ear infections and middle ear fluid can affect hearing
• Who to talk to, including the school district from age three

Why Can’t Strangers Understand My 3-Year-Old?

Intelligibility is the clinical word for the share of a child’s speech that a listener understands. In the definition the American Speech-Language-Hearing Association (ASHA) uses, it is a listener’s judgment about the child’s spontaneous, everyday speech, so it depends on the listener as well as on the child, and ASHA lists the listener’s familiarity with the way a child talks among the things that change it.

A 2015 study of 803 English-speaking children in Australia, aged 4 years to 5 years 5 months, shows the effect. Parents rated how well different people could understand their child, and across the group the children were rated most intelligible to their parents, then to immediate family, friends and teachers, and least intelligible to strangers.

A parent hears a child all day, knows which words are likely to come up and has learned how particular sounds tend to come out, so the parent can fill gaps that a stranger, hearing the child for the first time, cannot. For the same reason, strangers and the people who see your child least tend to miss the most.

From clinical practice

The better a parent understands a child, the less of the difficulty that parent hears. A parent is usually a child’s best interpreter, and so a parent’s own ear can underestimate how hard the child is to follow elsewhere.

The gap between familiar and unfamiliar listeners is part of what a speech-language pathologist looks at. How much do strangers understand? Teachers? Relatives? A parent’s sense of how other people follow the child is information the home alone cannot give.

What Makes a Child Easier or Harder to Understand?

Familiarity is only one of the things ASHA lists as changing how easy a child is to understand, and several of the others shift from one moment to the next:

• the child’s speech sound errors, and how fast they talk
• the words and grammar the child uses
• a single word compared with a whole conversation
• talking one-on-one compared with talking in a group
• cues from the child, such as gestures and facial expressions
• background noise

Because so many of these change with the setting, a child can be easy to understand one-on-one at home and much harder for a stranger to follow in a busy store, a noisy classroom or a room full of relatives. When someone misses what your child says, it helps to notice where it happened and whether your child was saying one word or a whole sentence, because those details are part of the picture.

What Strangers Understood in a Study of 538 Children

A 2021 study recorded 538 children aged 30 to 119 months, all of whom had passed checks of their speech, language and hearing, and whose main language at home was American English. Each child repeated recorded words and sentences while looking at a picture of each one, and 1,076 adult strangers, who had never met the children, wrote down what they heard. Intelligibility was the share of words written down correctly.

The researchers reported results by percentile, which describes the spread of children within the group studied: the 50th percentile is a child in the middle of the group, and the 5th percentile is a child near the slower end. For single words, strangers wrote down half of the words correctly at about 31 months for a child in the middle, and at about 47 months for a child near the slower end.

From the middle of the group to near the slower end, strangers understood half of the words in sentences at 34 to 46 months, three-quarters at 46 to 61 months and 90 percent at 62 to 87 months, while three-quarters of single words were understood at 49 to 87 months. The researchers found wide variation between children, and for those in the middle and lower part of the group, intelligibility was still growing through age 9.

The study’s figures describe repeated words written down by strangers, a different task from everyday conversation with family, and they describe a large group, not a figure any one child is meant to reach. ASHA’s milestone pages also say that children develop on their own timetables, siblings included, and may reach some milestones sooner and some later than other children do.

ASHA’s milestones for 3 to 4 years say that by age 4, a child speaks so that people can understand most of what they say, though some later sounds, such as l, r, s, sh and th, may still come out wrong.

Ear Infections, Middle Ear Fluid and Clear Speech

Ear infections are very common in early childhood, and the National Institute on Deafness and Other Communication Disorders (NIDCD) says five out of six children have at least one by their third birthday. The American Academy of Pediatrics (AAP) says fluid that builds up in the middle ear, from congestion, colds or ear infections, can cause mild hearing loss, which is usually only temporary.

In perhaps 1 in 10 children, the AAP says, fluid stays in the middle ear after an ear infection because of a problem with the Eustachian tube, the small tube that connects the middle ear to the throat. Children with that lingering fluid don’t hear as well and, the AAP says, sometimes have delays in talking.

NIDCD says fluid left behind after an infection usually clears within three to six weeks, but that fluid which stays a long time, or keeps coming back without infection, can affect a child’s hearing. A child with fluid behind the eardrum may have no symptoms at all, though a doctor can see it with an instrument, so a run of ear infections, or a cold that seems to dull your child’s hearing, is worth mentioning to your pediatrician alongside any concern about clear speech.

Noticing Who Understands Your Child, and Where

Notes from ordinary days help a speech-language pathologist see what you see. When evaluating a child who is hard to understand, ASHA suggests clinicians ask families how well the family and other people understand the child, and they may ask parents to record the child talking at home or to keep a log of the words the child means and how those words come out. Three things are worth gathering:

• Who misses words. A grandparent, a teacher, someone in a store, and roughly how often it happens.
• A recording or two. A short clip of your child talking during an ordinary activity at home.
• A word list. Words as they come out, each written beside the word your child meant.

For a child already working with a speech-language pathologist, there are ideas for home practice between therapy sessions, and why some sounds arrive later than others is covered in how children learn individual speech sounds, which fits within how speech and language develop overall.

Who to Talk to About Clear Speech

A concern that strangers cannot understand your child is worth raising whenever it is on your mind. Two signs from national bodies are worth knowing.

Among signs of a speech sound disorder at 2 to 3 years, ASHA lists a child being hard to understand, even for those who know the child well. The AAP’s list of signs of hearing loss tells parents to contact their pediatrician if a child’s speech is not understandable half the time by two and a half years of age; that is a reason to call, not a study finding.

NIDCD’s advice is to raise any concern with your child’s doctor, who may refer the family to a speech-language pathologist, the health professional who evaluates and treats speech and language disorders. NIDCD adds that hearing is often tested as part of that evaluation, because problems with hearing can affect how speech and language develop, and that an audiologist, who identifies and measures hearing loss, may suggest further evaluation. Who to call and what happens next are laid out in the steps to a speech evaluation.

Help Through the School District From Age Three

For a child who has turned three, Part B of the Individuals with Disabilities Education Act (IDEA) requires each state to make sure that children with disabilities who need special education and related services are identified, located and evaluated, whatever the severity of the disability. This duty is called child find, and from age three it runs through the local school district. IDEA defines a speech or language impairment to include impaired articulation that adversely affects a child’s educational performance, and a private speech-language pathologist is another route.

Common Questions From Parents

How Much of a 3-Year-Old’s Speech Should Strangers Understand?

Research describes groups, not a target for one child. In a 2021 study where adult strangers wrote down words children repeated, half the words in sentences were understood at 34 months for a child mid-group and at 46 months near the slower end, with wide variation.

Why Do I Understand My Child When Others Do Not?

Familiarity is one reason. ASHA lists how familiar a listener is with a child’s way of talking among the factors that change how much gets understood, and in one study parents rated their children easiest to understand for themselves and hardest for strangers.

Can Ear Infections Affect How Clearly a Child Speaks?

They can affect hearing, which matters for talking. The AAP says children with fluid lingering after an ear infection don’t hear as well and sometimes talk later, and NIDCD notes that a child with this fluid may show no symptoms, although a doctor can see it.

Who Should I Talk to If People Cannot Understand My Child?

Your child’s doctor is where NIDCD suggests starting, and a referral to a speech-language pathologist, who evaluates and treats speech and language, may follow. Hearing is often tested during that evaluation, and an audiologist may suggest further checks.

Can My Child Get Help Through the School District at Three?

From age three, the local school district carries out a federal duty to identify, locate and evaluate children with disabilities who need special education services, and the law’s definition of a speech or language impairment covers impaired articulation that adversely affects educational performance.

Reviewed by Monica d’Errico-Franklin, M.S., CCC-SLP

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