Speech therapy is worth considering any time you or your child struggles to communicate clearly, understand language, or swallow safely. About 7.2% of U.S. children ages 3 to 17 have had a voice, speech, or language disorder in the past year, and nearly 18 million adults report voice problems. These numbers are high enough that if something feels off, it probably warrants a closer look. The key is knowing what “off” actually looks like at different ages and in different situations.
Speech Milestones for Toddlers and Preschoolers
Children develop language on a loose schedule, but certain milestones give you reliable checkpoints. Between 12 and 24 months, a child should be picking up new words regularly, combining two words together (“more cookie,” “go bye-bye”), and following simple commands like “roll the ball.” They should use several consonant sounds at the beginnings of words and understand simple questions like “where’s your shoe?”
By age 2 to 3, a child typically has a word for almost everything, speaks in two- or three-word phrases, and can be understood by family members and close friends. If strangers can’t make out much of what your child says by age 3, that’s a meaningful signal.
Between 3 and 4, expect sentences of four or more words, the ability to answer basic “who,” “what,” “where,” and “why” questions, and smooth speech without repeated syllables or visible effort. A child this age should also talk about things that happened at daycare or a friend’s house, showing they can organize a simple narrative. Missing several of these milestones, not just one, is a strong reason to schedule an evaluation.
Stuttering vs. Normal Disfluency
All speech includes some interruption. Normal conversation has a 2% to 4% rate of breaks in fluency, and young children stumble over words even more as their brains race ahead of their mouths. Revisions (“I want the… I want that one”), filler words, and repeating whole words or phrases are common and rarely a concern.
The pattern shifts when a child repeats parts of words or individual sounds (“b-b-ball”), stretches sounds out for several seconds, or seems to get physically stuck mid-word. Visible tension in the face or neck, unexpected jumps in pitch or volume, and avoidance behaviors like saying “I can’t say it” or going quiet in social situations all point toward clinical stuttering rather than a developmental phase. A speech-language pathologist can distinguish between the two, and early intervention for stuttering tends to produce better results than a wait-and-see approach.
When Bilingual Development Looks Like a Delay
Children growing up with two languages sometimes appear to lag behind monolingual peers in one or both languages. This is often a language difference, not a disorder. Bilingual children may mix grammar rules across their languages or have a smaller vocabulary in each individual language while their combined vocabulary is on track.
A true language disorder shows up in both languages, not just one. Research comparing bilingual children to monolingual peers found that bilingual kids without any impairment performed similarly on measures of grammar and verb use. Children with genuine language impairment, however, scored significantly lower in both languages. If your bilingual child is struggling only in their second language, that’s likely a normal part of acquisition. If the difficulty appears across both languages, an evaluation is a good idea. Make sure the evaluator has experience with bilingual development, since features of one language can look like errors when judged by the rules of another.
Signs in Adults That Call for Evaluation
Speech therapy isn’t only for children. Adults may need it after a neurological event, because of a progressive condition, or for voice problems that develop over time. Two broad categories cover most adult speech disorders.
Aphasia is a loss of the ability to understand or produce language. It typically follows a stroke, brain injury, or brain surgery. A person with aphasia might know exactly what they want to say but can’t find the words, or they may struggle to follow conversations that were previously easy. About 2 million people in the U.S. currently live with aphasia.
Dysarthria involves slurred, slow, or poorly pronounced speech caused by weak or poorly coordinated muscles. The person’s language knowledge is intact, but the physical production of speech is impaired. Any sudden change in speech clarity, word-finding ability, or comprehension warrants prompt medical attention, because it can signal a stroke or other neurological emergency.
Swallowing Problems Are Speech Therapy Territory
Many people don’t realize that speech-language pathologists also treat swallowing disorders. If you or someone you care for coughs or chokes during meals, has a wet or gurgly voice after eating, feels like food is stuck in the throat, or regularly brings food back up through the nose, those are signs of dysphagia. Over time, untreated swallowing problems lead to weight loss, dehydration, and repeated chest infections.
A speech-language pathologist can assess how the swallowing muscles are working and recommend changes: modified food textures, thickened liquids, specific swallowing exercises, or positioning strategies during meals. In hospital settings, referral guidelines from the American Speech-Language-Hearing Association flag any patient who coughs or chokes while eating, has food or liquid leaking from the nose, takes significantly longer to finish meals, or has unexplained weight loss with swallowing difficulty.
After a Stroke: Timing Matters
Most language recovery after a stroke happens in the first few weeks, driven by the brain establishing alternative neural pathways and remodeling connections. Recovery follows three rough phases: an acute phase in the first hours to days, a subacute phase over the following weeks, and a chronic phase that stretches months to years and can continue indefinitely.
The ideal time to begin speech therapy after a stroke is still debated. One small trial found benefits when intensive therapy started about three days after the event. A larger trial that enrolled patients two weeks post-stroke, however, found no clear advantage over no therapy at the four-week mark, partly because spontaneous recovery in those early weeks makes it hard to measure what therapy itself contributes. What is clear is that therapy remains beneficial well into the chronic phase. People with aphasia can continue making meaningful gains months and even years after a stroke, so it is never too late to start.
Why Earlier Is Generally Better
For children, the case for early evaluation is strong. Research on children with autism spectrum disorder found that those diagnosed and treated early, primarily with speech and occupational therapy, showed major improvements in language, communication, and social skills. Children diagnosed later received more aggressive treatment but still didn’t match the outcomes of the early group. The brain’s capacity for language learning is highest in the first few years of life, and therapy during that window takes advantage of that flexibility.
This doesn’t mean older children or adults can’t benefit. It means that if you’re on the fence about whether a concern is “serious enough,” getting an evaluation sooner removes the guesswork. An evaluation that finds nothing wrong costs you a couple of hours. A delayed evaluation that misses an early treatment window costs much more.
What Happens During an Evaluation
A speech-language pathology evaluation is thorough but not intimidating. It typically includes a case history covering medical, educational, cultural, and linguistic background. The clinician will interview you (and your child’s teachers or caregivers, if relevant), then review hearing, vision, motor, and cognitive status to rule out other factors.
The core of the evaluation involves standardized and non-standardized tests of speech sounds, spoken and written language, and sometimes cognitive-communication skills or swallowing function. For children, this often looks like structured play, picture naming, storytelling, and following directions. For adults, it may include reading passages aloud, describing pictures, answering questions, and repeating sentences. The evaluator will also observe natural communication and analyze how the person uses language in real conversation, not just on formal tests.
At the end, you’ll get a clear picture of whether therapy is recommended, what specific areas need work, and what strategies might help right away. Many families leave an evaluation feeling relieved simply because they finally have concrete information instead of worry.