2.5 year old speech delay: what parents in the trenches actually need to know

Most 2.5-year-olds have at least 50 words and are combining two of them into little phrases like "more juice." If your child isn't doing that yet, it's worth having them evaluated now rather than waiting for the next well-child visit. Getting help before age 3 tends to lead to better outcomes than waiting to see what happens, and the first step doesn't cost anything: your state's early intervention program will do a free evaluation.

What should a 2.5 year old actually be saying?

There's real range at this age, but there are also real floors, and it helps to know where they sit. By 24 months, the American Academy of Pediatrics expects children to use at least 50 words and put two together, like "daddy go" or "more milk" ^[1]. By 30 months, most kids have somewhere between 200 and 300 words, and two-word combinations should be the baseline they've already moved past, not something you're still waiting for ^[2].

2.5 years old is 30 months. So if your child has fewer than 50 words, or has words but never puts two of them together, that counts as a speech delay. That's not you overreacting. That's just where the line falls clinically.

How well strangers understand your child matters too. By 24 months, unfamiliar listeners should understand roughly half of what a child says. By 36 months that should be up to about 75% ^[2]. If you're still the only one who can translate your kid, that's worth mentioning to a speech-language pathologist.

One thing that gets confused constantly: a speech delay and a language delay aren't the same thing. Speech is the physical production of sounds. Language is understanding and using words and grammar. A child can have trouble with one, the other, or both, and a proper evaluation figures out which. Parents, and honestly even some pediatricians, use the two terms interchangeably, which ends up blurring what's actually being treated.

What are the most common causes of speech delays in 2 year olds?

There's rarely one clean answer. Speech delays at this age usually come from several overlapping factors, and sometimes doctors never pin down a specific cause at all. Still, some causes show up more often than others and have real evidence behind them.

Hearing loss is the first thing any clinician checks, and for good reason. Even mild or fluctuating hearing loss from repeated ear infections can slow down language acquisition ^[3]. ASHA (the American Speech-Language-Hearing Association) names hearing loss as one of the main organic causes of delayed speech and language, so if your child hasn't had a formal audiological evaluation yet, that comes before almost anything else.

Oral motor issues cover a lot of ground. Some children have low muscle tone in the lips, tongue, or jaw, which makes clear speech physically difficult. When the trouble is specifically with planning and coordinating the movements needed for speech, it's sometimes called childhood apraxia of speech (CAS). CAS isn't the same as a plain delay: a child with CAS may know the words they want to say but can't reliably get the sounds to come out ^[4].

Drooling and speech delay sometimes appear side by side in 2 year olds. Drooling that persists past 18 to 24 months can point to the same oral motor control problems that affect speech, though drooling by itself doesn't diagnose anything. A speech-language pathologist who works in feeding and oral motor skills can figure out whether the two are connected for a particular child.

Developmental and neurological factors include autism spectrum disorder, global developmental delay, and differences in language processing. Autism affects communication in its own particular ways: a child may have words but use them inconsistently, may not reliably respond to their name, or may lose words they'd already learned. That last pattern, losing words a child once had, always deserves a prompt evaluation ^[1].

Environmental factors matter too, but they get blown out of proportion in ways that leave parents feeling blamed for no reason. Growing up in a multilingual household does not cause speech delays. The research on screen time is messier than people assume: heavy background TV is linked to fewer words directed at children, which can slow language down, but current AAP guidance focuses on interactive, high-quality media rather than treating every screen as harmful ^[1]. Prematurity is a genuine risk factor, though. Babies born before 37 weeks have higher rates of speech and language delay, and many of their milestones need to be adjusted for gestational age.

A good number of cases end up labeled idiopathic, which just means nobody can identify a clear cause. That's an unsatisfying answer, but at least it's honest, and it doesn't really change what you do next.

How is a speech delay at 2.5 different from autism?

A speech delay and autism aren't the same thing, though they overlap a lot: roughly 80% of autistic children have some form of speech or language difference ^[5]. That overlap is exactly why so many parents get confused trying to tell them apart.

The real difference isn't about how many words a child has. It's about the whole picture of social communication. A child with an isolated speech delay usually makes good eye contact, points to share interest rather than just to request things, plays back and forth with others, clearly enjoys people, and understands far more than they can say. An autistic child's communication differences run broader than word count alone.

Pediatricians use the M-CHAT-R/F (Modified Checklist for Autism in Toddlers, Revised with Follow-Up), a free, validated screening tool, at the 18 and 24-month well-child visits ^[1]. If you're worried and your next appointment feels too far off, you can find it through the CDC's Learn the Signs. Act Early. program ^[11]. It won't diagnose autism, but it flags kids who need a closer look.

Here's what surprises most parents: the distinction matters less for your immediate next step than you'd expect. Whether it turns out to be an isolated speech delay or an autism-related communication difference, the starting move is the same. Get a speech-language pathology evaluation, get into early intervention if the child is under 3, and start working on communication now. You can learn more about autism spectrum speech therapy if you want to understand what that path looks like.

Don't wait for an autism diagnosis before pursuing speech therapy. The two processes can, and should, run side by side.

What does early intervention actually involve, and how do you access it?

Early intervention (EI) is a federally mandated program under Part C of the Individuals with Disabilities Education Act (IDEA). Every state has to provide free evaluation and services to children under 36 months who have a developmental delay or a condition with a high probability of delay ^[6]. You don't need a doctor's referral for this. You call your state's EI program directly.

The evaluation itself is free. If your child qualifies, services come at low or no cost depending on family income and state rules, and they're delivered in a natural environment, which usually just means your home ^[6]. An Individualized Family Service Plan (IFSP) lays out what services your child will get and how often.

Timing matters here. Federal law requires the evaluation to begin within 45 days of the referral, and services should start soon after the IFSP is signed. Wait times still vary a lot by state and region in practice, which is why parents in forums keep passing along the same advice: call today, don't wait until the next pediatrician visit.

Once a child turns 3, EI ends and services shift to Part B of IDEA through the local school district. That transition requires its own evaluation and, if the child qualifies, an Individualized Education Program (IEP). The 3rd birthday is a hard cutoff, so if your 2.5-year-old hasn't been evaluated yet, that window is closing fast.

Private speech therapy is another route, and plenty of families run it alongside EI, especially when EI only offers once-a-week sessions and the child needs more than that. Insurance coverage varies a lot. The federal Mental Health Parity and Addiction Equity Act requires speech-language pathology to be covered when it treats a diagnosable condition, but coverage limits, prior authorization rules, and what counts as "medically necessary" differ by plan ^[7]. Staff at pediatric speech therapy clinics often help families work through the insurance side of things.

If you want a sense of what sessions actually look like day to day, early intervention speech and language therapy walks through that in practical terms.

Should you wait and see, or act now?

Every parenting forum has someone ready with the same soothing advice: boys talk late, Einstein didn't speak until he was 3, a nephew said nothing until 3.5 and turned out fine. All of that is true for some children, and all of it is a bad basis for a decision.

Here's what the research actually says: at 2.5, there's no reliable way to tell which late talkers will catch up on their own and which won't ^[8]. The kids who catch up without any help look pretty much the same at this age as the ones who don't. So waiting to see which group your child falls into means using up the stretch of time when language development has the most room to shift.

A 2011 meta-analysis by Roberts and Kaiser in the American Journal of Speech-Language Pathology found that children who got early speech-language intervention ended up with better language outcomes than those who didn't, and the effect was strongest for kids who started before age 3 ^[9]. That's not an argument that your child is headed for years of therapy. It's that an evaluation costs you nothing if it turns out everything is fine, while waiting has a real potential downside.

Some pediatricians default to wait-and-see, and a few months of watchful waiting with an actual recheck date on the calendar is fine, that's different from an open-ended delay. But if you hear "don't worry, he'll talk when he's ready" with no follow-up plan and no referral offered, push back. Ask for a referral to a speech-language pathologist, or call your state's early intervention program directly.

You don't need a doctor's sign-off to refer yourself to EI.

What actually happens in a speech evaluation?

A speech-language pathology (SLP) evaluation at this age runs 60 to 90 minutes and covers a lot of ground in one sitting. The SLP watches your child play, runs a few standardized assessments, and asks you questions about how your child communicates day to day.

Two common tests for this age are the Preschool Language Scales (PLS-5) and the Communication and Symbolic Behavior Scales (CSBS). Both compare your child against other kids the same age and produce separate scores for what the child says (expressive language) and what the child understands (receptive language) ^[2].

Parents tend to focus on the words their child says out loud and miss the understanding side, mostly because it's harder to see. A child who seems to follow everything but barely talks is working from a different profile than a child who struggles with both understanding and speaking, and that distinction changes what the treatment plan looks like.

The SLP will also check oral motor function, articulation, voice, fluency, and pragmatics: how your child uses language socially, takes turns, points to share interest. If there's been drooling or trouble with certain food textures, some evaluations add a feeding and swallowing check too, since the same muscles are doing both jobs.

You'll walk away with a written report that includes scores, an interpretation of what they mean, a diagnostic impression if one applies, and recommendations for next steps. Terms like "expressive language delay" or "mixed receptive-expressive language delay" are clinical labels used to open the door to services, not something that follows your child forever. If you're curious how that clinical finding turns into paperwork for insurance, speech delay ICD-10 codes are the billing language it gets translated into.

What milestones should parents track between now and age 3?

Keeping tabs on progress at home gives you something concrete to bring to evaluations and lets you see whether things are actually moving. Here's how expressive and receptive language, along with intelligibility, typically shift across the toddler years, based on CDC and ASHA guidance ^[1][2].

Age	Expressive language	Receptive language	Intelligibility
18 months	~20 words	Points to body parts when named	~25% to strangers
24 months	50+ words, 2-word phrases	Follows 2-step directions	~50% to strangers
30 months	200+ words, 2-3 word phrases	Understands location words (in, on, under)	~65-70% to strangers
36 months	300-500 words, 3-word sentences	Answers 'who,' 'what,' 'where' questions	~75% to strangers

Treat these as midpoint expectations rather than pass-fail lines. A child who reaches 30 months with 100 clear words and steady two-word combinations is doing noticeably better than one with 30 words and no combining at all, even though both technically fall short of the chart.

Pay close attention to that intelligibility column. Parents tend to understand their own child much better than the typical numbers would suggest, which can mask how hard a stranger has to work to follow along. Every so often, it helps to ask someone who doesn't know your child well to spend fifteen minutes talking with them and give you an honest read on what came through and what didn't.

What can parents do at home to support speech development?

Nothing here replaces therapy if therapy is indicated. But most of a toddler's language learning actually happens at home, and a handful of strategies have real evidence behind them.

Start by narrating what's happening right now. Running commentary on whatever you're doing together, what SLPs call self-talk and parallel talk, gives kids a steady stream of language matched to something they can actually see and touch. "I'm washing the cup. Now I'm putting it on the shelf." You'll feel a little ridiculous saying things like this out loud. Do it anyway.

When your child talks, build on it. If they say "truck," you say "big truck" or "red truck goes fast." You're not correcting them, you're showing them the next step up. Research on parent-implemented strategies consistently shows this kind of expansion speeds vocabulary growth ^[9].

Read together every day. Shared book reading is one of the highest-return language activities there is. Toddler books with clear pictures let you label things, ask questions, and tie words to images in a way passive screen time just can't. You don't need to read the text word for word. Talking about the pictures counts just as much.

Turn off background noise during language-rich moments. A TV running in the background pulls adult attention away from talking to your child, and observational studies tie this to fewer words directed at toddlers per hour ^[10]. That doesn't mean silence all day, just being deliberate about when the TV is on.

And follow your child's lead. Whatever has their attention right now is what their brain is primed to learn language about. If they're obsessed with a toy train, narrate the train. Resist the urge to redirect toward something you consider more educational.

If you want a structured tool for at-home support, Little Words has a quiz that helps parents figure out where their child stands and what to work on between therapy sessions, built with late talkers and neurodivergent kids in mind. And for a closer look at the techniques SLPs teach families most often, this guide to speech therapy for kids walks through the at-home strategies that tend to stick.

Forums are where a lot of parents end up at 2 a.m., scrolling for reassurance that they're not the only ones dealing with this. That part actually helps. Hearing from other people who've been through the same worry, the same waiting rooms, the same sleepless questions, is worth something real. The problem is that the same forums spread misinformation just as easily, and a handful of patterns come up again and again. The "my late talker turned out fine" story is common, but it's shaped by who sticks around to tell it. Parents whose kids ended up with serious, lasting needs aren't usually the ones still posting in toddler forums when their child turns 5. You mostly hear from the families whose kids caught up. The ones who didn't are just quieter about it, not absent. Distrust of early intervention shows up a lot too, and it's not always unreasonable. Some of it comes from genuinely bad experiences with underfunded programs, since EI quality differs a great deal depending on the state, county, and even which provider you're assigned. A disappointing experience with one program doesn't mean therapy itself doesn't work. It might just mean that particular program didn't have the resources to do it well. There's also a real cost to waiting. Kids who had speech delays at 5 and weren't treated at 2 or 3 aren't a hypothetical, they're a documented outcome. Research on untreated language delays has found lasting effects on reading, academic performance, and social relationships that persist through middle school ^[8]. So when a forum thread tells you to relax because he'll catch up on his own, that advice isn't free of consequences. At the same time, forums can swing the other way and catastrophize. Not every late talker is autistic, and not every delay means years of struggle ahead. Plenty of kids do a few months of speech therapy around age 2 and close the gap completely. Outcomes vary widely in both directions. The honest way to use these forums is for emotional support, not clinical direction. Save the actual medical and developmental questions for your child's SLP or pediatrician.

When should a parent push for more than a speech evaluation?

Starting with a speech-language pathology evaluation makes sense, but it isn't always the only piece of the puzzle. Depending on what else is going on, a few other workups might belong on the list.

Hearing should be checked by an audiologist alongside any speech evaluation if your child hasn't had a formal hearing test since the newborn screen. That screen is built to catch severe hearing loss, not the mild or progressive kind. A 2.5-year-old with repeated ear infections, or one who passed the newborn screen but has had fluid in the ears over and over, could have a hearing problem nobody's caught yet.

A developmental pediatrician makes sense when there's more going on than speech alone: motor delays, very rigid play patterns, strong sensory sensitivities, or any regression, meaning a child has lost skills they once had. This kind of specialist can coordinate a wider evaluation and refer for a full diagnostic assessment if autism or another condition seems likely.

Occupational therapy evaluations come into play when low muscle tone, sensory processing issues, or fine motor delays show up alongside the speech delay. These tend to travel together.

A neurological consult is less common at this age, but it becomes relevant if there are concerns about seizures, noticeable motor asymmetries, or a family history of neurological conditions.

You don't have to figure out on your own which referrals your child needs. What matters more is giving your pediatrician the complete picture, everything you've noticed, not just the speech piece. Pediatricians triage well when they're working with full information. If you're navigating this process yourself, Speech therapy speech therapist walks through how to find and vet providers.

What does the research actually say about outcomes for late talkers?

The honest answer is that the research is messier than forums make it sound, in either direction.

Studies on late talkers (children who are late to talk but have no other identified developmental differences) show that roughly 50 to 70% catch up to peers by school age without intervention, depending on how the study defines catch-up ^[8]. That sounds reassuring, until you notice it also means 30 to 50% don't. At 2.5 years old there's no reliable way to know which group your own child belongs to.

Reilly and colleagues, in a 2010 Pediatrics study tracking late talkers, found that late talking at age 2 was a weak predictor of language at 4 ^[8]. That cuts both ways: plenty of kids catch up, but there's no way to tell in advance who won't. On the treatment side, parent-implemented therapy (where a clinician coaches the parent rather than working with the child directly) turns out to be about as effective as clinician-only therapy for mild to moderate delays ^[9]. That's worth sitting with for a moment, because it tells you two things at once: what you do at home genuinely matters, and parent coaching is a real treatment approach, not a cheaper stand-in for the real thing.

One split in the data matters more than most. Children with broader language delays, where understanding is affected and not just speaking, recover on their own less often than children whose delay is limited to expressive language ^[8]. So if your child seems to follow along and understand plenty, the odds of catching up unassisted are better than if they struggle with simple directions or questions.

Long-term follow-up studies keep landing on the same conclusion: language delays at age 2 to 3, if still unresolved by school entry, predict lower reading achievement and higher rates of learning disabilities in the early school years ^[3]. None of that is inevitable, and these effects do respond to intervention. But they're real enough that acting early is a reasonable, well-supported instinct rather than an overreaction.

How do you find a qualified speech-language pathologist for a toddler?

Look for the Certificate of Clinical Competence in Speech-Language Pathology (CCC-SLP) from ASHA. It means the clinician has a master's degree, more than 400 clinical hours, a completed fellowship year, and a passed national exam ^[2]. State licensure is a separate requirement on top of that, and you can check both.

ASHA's ProFind tool at asha.org lets you search by zip code and specialty. Filter for "early childhood" and "language disorders." If you're considering a private practice, just ask whether the clinician regularly works with toddlers. Some SLPs focus on adults or school-age kids, and that's not always a good match for a 2.5-year-old.

If in-person options are hard to reach because of location, cost, or long wait times, online speech therapy is worth a look. It's grown a lot since 2020, and ASHA now recognizes it as an appropriate way to deliver speech-language services. For toddlers, telehealth SLP usually works through parent coaching, with the clinician guiding you through activities in real time over video while you work directly with your child.

Costs vary quite a bit. A private-pay evaluation typically runs $200 to $500 depending on region and provider, and treatment sessions usually cost $100 to $300 each without insurance. Early Intervention services, by contrast, are free or low-cost under federal law for children under 3 ^[6].

If cost is what's holding you back, start with EI regardless of what you think the outcome will be. The evaluation costs nothing. If your child doesn't qualify, you've still learned something useful. If they do qualify, you get free services. There isn't really a version of this where calling EI first turns out to be a mistake.

Frequently asked questions

How many words should a 2.5 year old be saying?

Most children this age have around 200 to 300 words and are starting to combine two or three words into short phrases. The floor set by the CDC and AAP for 24 months is 50 words plus two-word combinations, so a 2.5 year old still under 50 clear words, or not yet putting words together, should be seen by a speech-language pathologist rather than waiting it out.

Is my 2.5 year old's speech delay a sign of autism?

It's possible, but a speech delay by itself doesn't tell you that. Autism involves broader differences in social communication: less eye contact, inconsistent response to their name, little pointing to share interest, and sometimes loss of words a child already had. A child who's behind on speech but otherwise social and engaged is a different picture entirely. A developmental pediatrician or an SLP evaluation can help figure out which one fits.

What causes speech delays in 2 year olds?

Hearing loss is always checked first. Beyond that, common causes include oral motor difficulties such as childhood apraxia of speech, general developmental delays, autism spectrum disorder, premature birth, and sometimes limited language exposure at home. Often, though, no clear cause is ever found. Because these causes overlap so much, a full evaluation looks at several areas at once rather than assuming one explanation.

My 2 year old is drooling a lot and has a speech delay. Are they related?

They can be. Drooling that continues past 18 to 24 months sometimes points to the same oral motor control issues that affect how clearly a child speaks. On its own it doesn't diagnose anything, and plenty of children who drool have no speech concerns at all. But when both show up together, it's worth having an SLP with feeding and oral motor experience look at both, since the same muscles are involved in each.

How do I refer my child to early intervention?

You don't need a doctor's referral: you can call yourself. Look up your state's early intervention program (most have one central intake line), or check the CDC's early intervention page for a state-by-state directory. Under federal law (IDEA Part C), your child is entitled to a free evaluation within 45 days, and free or low-cost services if they qualify and are under 36 months. There's nothing stopping you from making that call today.

Will my 2.5 year old just catch up on their own?

Some do, some don't. Research suggests roughly 50 to 70% of children with isolated expressive delays (meaning they understand fine but struggle to produce words) catch up by school age, but there's no reliable way to know at 2.5 which group your child belongs to. Kids with both receptive and expressive delays catch up on their own less often. An evaluation is really the only way to find out where your child stands and whether intervention makes sense right now.

What's the difference between a speech delay and a language delay?

Speech is the physical act of producing sounds and words clearly. Language is understanding and using words and grammar to communicate. A child can struggle with one and not the other, though most kids brought in for a "speech delay" turn out to have a language delay, or both. An SLP assessment sorts out which is actually going on.

Does bilingualism cause speech delays in toddlers?

No. Bilingual toddlers often split their vocabulary across two languages, so neither one alone may hit the 50-word mark right away, but added together their total vocabulary usually matches monolingual peers. Bilingualism itself isn't a risk factor for speech or language delays. ASHA is clear on this: bilingual children should be evaluated in both languages, and being bilingual does not cause communication disorders.

How much does speech therapy for a 2.5 year old cost?

If your child qualifies for early intervention, it's free or low-cost for children under 3 under federal law. Paying privately, evaluations run roughly $200 to $500, and ongoing sessions typically cost $100 to $300 each depending on region and provider. Insurance varies quite a bit: many plans cover speech therapy when it's medically necessary, but expect prior authorization requirements and session limits. For anyone under 3, EI is the place to start since it costs nothing to find out if your child qualifies.

What happens to speech delays that aren't treated by age 5?

Research consistently links language delays that are still present at school entry to lower reading achievement, more learning difficulties, and more social struggles through the school years. Speech delays showing up at age 5 can often be traced back to toddler-age delays that were never addressed. That doesn't mean lasting difficulty is guaranteed, but it's a real enough risk that acting early, while a child's brain is most adaptable, is worth taking seriously.

Can I do speech therapy activities at home without a therapist?

Yes, parent-implemented strategies taught by an SLP genuinely work for mild to moderate delays. This includes expanding on what your child already says, narrating shared activities out loud, reading together daily, and following whatever your child is already interested in. A 2011 meta-analysis found that parent-coaching approaches produced vocabulary gains comparable to therapy delivered solely by a clinician for mild delays. Home practice adds to professional evaluation and guidance, though, it doesn't replace it when there's a real delay.

Should I be worried if my 2.5 year old is hard to understand?

Yes, if people outside your family generally can't understand them. By 30 months, typically developing children are understood by unfamiliar listeners about 65 to 70 percent of the time. If strangers regularly can't follow what your child is saying at all, that's worth raising in a speech evaluation. Keep in mind parents usually understand their own kids better than these norms would suggest, which can make a real gap harder to notice at home.

What's the M-CHAT and should I use it for my 2.5 year old?

The M-CHAT-R/F is a validated autism screening tool usually given at the 18 and 24-month well visits, but it can still be done at 2.5 if it was missed. It screens for social communication differences related to autism, not speech delay on its own, and a positive screen doesn't mean your child has autism, just that they need a closer look. It's free through the CDC's Learn the Signs. Act Early. program.

What's the difference between early intervention and preschool special education services?

Early intervention covers birth to age 3 under IDEA Part C, is usually delivered at home, and is centered on the family. Preschool special education covers ages 3 to 5 under IDEA Part B, runs through the local school district, and is school-based. There's a formal transition process around a child's third birthday, and Part B services require an IEP rather than the IFSP used in EI, with eligibility rules that can differ slightly between the two.

Sources

1. American Academy of Pediatrics, Developmental Milestones: AAP expects 50 words and two-word combinations by 24 months; recommends screening at 18 and 24 months; identifies word regression as always warranting prompt evaluation
2. American Speech-Language-Hearing Association (ASHA), Speech and Language Developmental Milestones: ASHA milestones for expressive vocabulary (200-300 words by 30 months), intelligibility benchmarks (50% at 24 months, 75% at 36 months), and CCC-SLP credential requirements
3. National Institute on Deafness and Other Communication Disorders (NIDCD), Speech and Language Developmental Milestones: Hearing loss listed as primary organic cause of delayed speech and language development; long-term academic effects of unresolved language delays
4. ASHA, Childhood Apraxia of Speech: CAS defined as a motor speech disorder where the child has vocabulary but cannot reliably plan and coordinate the movements for speech production
5. Autism Science Foundation, Communication and Autism: Approximately 80% of autistic children have some form of speech or language difference
6. U.S. Department of Education, IDEA Part C Early Intervention Program: IDEA Part C mandates free evaluation and services for children under 36 months with developmental delays; evaluation must begin within 45 days of referral; services delivered in natural environments
7. U.S. Department of Labor, Mental Health Parity and Addiction Equity Act: Federal Mental Health Parity and Addiction Equity Act requires speech-language pathology to be covered when treating a diagnosable condition under the same terms as medical-surgical benefits
8. Reilly S, et al. 'Predicting language at 4 years of age from late talking at 2 years.' Pediatrics, 2010: Approximately 50-70% of late talkers with isolated expressive delays catch up by school age; children with receptive and expressive delays catch up at lower rates; late talking at 2 is a weak predictor of language at 4
9. Roberts MY, Kaiser AP. 'The Effectiveness of Parent-Implemented Language Interventions: A Meta-Analysis.' American Journal of Speech-Language Pathology, 2011: Early speech-language intervention produces better outcomes than no intervention; parent-implemented approaches are comparable to clinician-only therapy for mild to moderate delays; effect largest for children starting before age 3
10. Zimmerman FJ, et al. 'Associations between media viewing and language development in children under age 2 years.' Journal of Pediatrics, 2007: Background television is associated with fewer adult words directed at toddlers per hour, which reduces language input and is associated with slower vocabulary development
11. CDC, Learn the Signs. Act Early. Developmental Milestones: CDC milestone guidance and M-CHAT-R/F screening tool availability; CDC developmental milestone checklists for 18, 24, and 30 months