Speech and Language Delays in Children

Table of Contents

1. What Are Speech and Language Delays?
2. Speech Delay vs. Language Delay vs. DLD
3. Developmental Milestones: What to Expect
4. Warning Signs Across Age Groups
5. Causes and Risk Factors
6. How Speech and Language Is Evaluated
7. Speech-Language Therapy: What the Evidence Shows
8. What Parents and Caregivers Can Do at Home
9. Long-Term Outcomes: Why Early Intervention Matters
10. What Families Can Do
11. A Note for Clinicians
12. References

1. What Are Speech and Language Delays?

Speech and language development is one of the most important milestones of early childhood and one of the most common sources of parental concern. Approximately 1 in 12 children ages 3–17 in the United States have a speech or language disorder, making this one of the most prevalent developmental challenges seen in pediatric primary care and early childhood settings (Rupert et al., 2023).

A speech delay refers to a child whose spoken language is developing more slowly than expected for their age. They may produce fewer words, have difficulty with pronunciation, or be difficult to understand compared to same-age peers. A language delay refers to difficulty developing the broader system of language, including the rules, vocabulary, and structures used to understand and express meaning. The two often co-occur but represent different aspects of communication development (Feltner et al., 2024; Rupert et al., 2023).

When speech and language delays are identified and addressed early, ideally before age 3, outcomes are significantly better than when intervention is delayed. The brain’s capacity for language learning is greatest in the early years, and early speech-language therapy consistently produces durable gains that persist over time (Pak et al., 2023).

2. Speech Delay vs. Language Delay vs. Developmental Language Disorder

These three terms are often used interchangeably but they describe meaningfully different clinical situations. Understanding the difference helps families know what to expect and helps clinicians communicate clearly about prognosis and treatment (Feltner et al., 2024; Rupert et al., 2023).

Speech delay refers specifically to difficulty with the production of speech sounds, including articulation, pronunciation, and intelligibility. A child with a speech delay may have a clear understanding of language and good vocabulary but is hard to understand when speaking. Speech delays often respond well to targeted speech-language therapy (Rupert et al., 2023).

Language delay refers to slower-than-expected development of language, including vocabulary, grammar, comprehension, and the ability to construct and understand sentences. Language delay may affect expressive language (what the child produces), receptive language (what the child understands), or both. Some children with early language delays catch up without intervention; others require ongoing support (Feltner et al., 2024).

Developmental Language Disorder (DLD) is a lifelong neurodevelopmental condition characterized by persistent, significant language difficulties that affect daily functioning, in the absence of another known cause such as hearing loss, intellectual disability, or Autism Spectrum Disorder. DLD is not a phase. It persists into adolescence and adulthood and is associated with long-term impacts on academic achievement, employment, social relationships, and mental health (Van Barreveld et al., 2025; Wilmot et al., 2024).

3. Developmental Milestones: What to Expect

Speech and language milestones provide a framework for recognizing typical development and identifying potential delays. These milestones represent the age by which most children achieve each skill, not the age by which all children must (Rupert et al., 2023; Feltner et al., 2024).

Birth to 6 months (Rupert et al., 2023):

• Coos, gurgles, and makes soft vowel sounds in response to familiar voices
• Startles at loud sounds and turns toward familiar voices
• Smiles and makes eye contact during interactions

6 to 12 months (Rupert et al., 2023):

• Babbles with a variety of consonant-vowel combinations such as ba-ba, ma-ma, and da-da
• Responds to their name and simple words like “no”
• Uses gestures such as waving, pointing, and reaching to communicate
• First words may begin to emerge around 12 months

12 to 24 months (Rupert et al., 2023; Feltner et al., 2024):

• Approximately 10 words by 12 to 15 months and 50 or more words by 24 months
• Begins combining two words by 24 months, such as “more juice” or “daddy go”
• Understands simple instructions such as “Give me the ball” and “Come here”
• Points to show things of interest and to make requests

2 to 3 years (Rupert et al., 2023):

• Uses 200 to 300 words and three-word phrases by age 2, and simple sentences by age 3
• Speech is understandable to familiar adults about 50 to 75 percent of the time by age 2, and 75 to 100 percent by age 3
• Asks simple questions and follows two-step instructions

3 to 5 years (Rupert et al., 2023; Feltner et al., 2024):

• Sentences become longer and more complex, and most speech sounds are produced correctly
• Tells simple stories, asks many questions, and engages in back-and-forth conversations
• Speech is understandable to unfamiliar adults by age 4 to 5
• Knows colors, numbers, and basic concepts

4. Warning Signs Across Age Groups

The following signs at any age warrant prompt referral to a speech-language pathologist for evaluation (Rupert et al., 2023; Feltner et al., 2024).

Infants and toddlers (birth to 24 months) (Rupert et al., 2023; Feltner et al., 2024):

• No babbling by 12 months
• No gestures such as pointing or waving by 12 months
• No single words by 16 months
• No two-word combinations by 24 months
• Any loss of previously acquired language or social skills at any age requires immediate evaluation
• Does not respond to their name by 12 months

Preschool age (2 to 5 years) (Rupert et al., 2023; Feltner et al., 2024):

• Fewer than 50 words at 24 months or not combining words by 30 months
• Speech that is mostly unintelligible to unfamiliar adults after age 3
• Difficulty following simple instructions appropriate for age
• Frustration, tantrums, or withdrawal related to difficulty communicating
• Avoidance of social interaction or play with peers

School age (5 years and older) (Van Barreveld et al., 2025; Rupert et al., 2023):

• Difficulty learning to read or spell despite appropriate instruction
• Trouble following classroom directions or understanding lessons
• Difficulty retelling stories, organizing thoughts, or explaining ideas
• Social difficulties related to communication, such as being frequently misunderstood, avoiding conversation, or struggling to make friends
• Continued speech sound errors that make the child difficult to understand

5. Causes and Risk Factors

Speech and language delays have multiple potential causes, and in many children no single cause is identified. Understanding risk factors helps with early identification and appropriate referral (Ali et al., 2025; Rupert et al., 2023).

Biological and medical risk factors (Rupert et al., 2023; Feltner et al., 2024):

• Hearing loss: The most common and most treatable cause of speech and language delay. Even mild, fluctuating hearing loss from recurrent ear infections can significantly affect language development. Hearing should be tested in every child referred for speech-language concerns (Rupert et al., 2023).
• Prematurity: Premature birth is associated with increased risk of speech and language delays, as well as broader developmental challenges (Feltner et al., 2024).
• Neurological conditions: These include Autism Spectrum Disorder, cerebral palsy, intellectual disability, traumatic brain injury, and seizure disorders, all of which affect language development through different mechanisms (Feltner et al., 2024).
• Oral-motor differences: Structural differences affecting the mouth, tongue, palate, or jaw, including cleft palate, can affect speech production and intelligibility (Rupert et al., 2023).

Genetic and family factors (Ali et al., 2025):

• Family history of speech or language delay is one of the strongest individual risk factors. Children with an affected first-degree relative are more than twice as likely to have speech delay (Ali et al., 2025)
• Male sex is a significant risk factor. Boys are approximately 3 times more likely to have speech delay than girls (Ali et al., 2025)
• DLD has a significant genetic component. It runs in families and is associated with specific gene variants affecting language-related brain development (Van Barreveld et al., 2025)

Environmental and social factors (Feltner et al., 2024; Rupert et al., 2023):

• Reduced quantity and quality of language input at home is associated with slower vocabulary development, though it is not a cause of DLD itself (Pak et al., 2023)
• Excessive screen time without interactive communication has been associated with reduced language input and delayed vocabulary development in toddlers (Feltner et al., 2024)
• Lower socioeconomic status is associated with higher rates of language delay, largely through reduced access to language-rich environments and early intervention services (Feltner et al., 2024)

6. How Speech and Language Is Evaluated

A comprehensive speech and language evaluation is conducted by a licensed speech-language pathologist (SLP) and typically includes multiple components to build a complete picture of the child’s communication abilities (Rupert et al., 2023; Feltner et al., 2024).

• Parent and caregiver interview: Detailed developmental history including prenatal and birth history, developmental milestones, medical history, family history of speech or language concerns, and current communication in daily life at home and in childcare settings (Rupert et al., 2023)
• Hearing screening or referral: Hearing should be assessed or confirmed normal as part of every speech and language evaluation. Hearing loss must be ruled out before other causes are pursued (Rupert et al., 2023; Feltner et al., 2024).
• Standardized language testing: Norm-referenced assessments that compare the child’s performance to same-age peers across receptive language, expressive language, vocabulary, grammar, and sentence structure (Feltner et al., 2024)
• Speech sound assessment: Evaluation of which speech sounds the child produces correctly and incorrectly, how intelligible their speech is to familiar and unfamiliar listeners, and whether speech errors are developmental or suggest an underlying motor speech disorder (Rupert et al., 2023)
• Language sample analysis: Observing and analyzing the child’s spontaneous communication during play or structured activities. This is often the most ecologically valid window into real-world language use (Feltner et al., 2024).
• Oral-motor examination: Assessment of the structure and function of the mouth, lips, tongue, and palate for any physical factors affecting speech production (Rupert et al., 2023)

Evaluation findings lead to a clinical profile that guides whether intervention is recommended, what type of intervention is appropriate, and at what intensity. Results are shared with parents and the child’s pediatrician, and referrals to audiology, neurology, or developmental pediatrics are made when appropriate (Feltner et al., 2024).

7. Speech-Language Therapy: What the Evidence Shows

Speech-language therapy is effective for children with speech and language delays and disorders. The evidence is clear and consistent across multiple systematic reviews and meta-analyses (Fan et al., 2022; Donolato et al., 2023; Pak et al., 2023).

A 2022 meta-analysis examining language therapy alone for children with developmental language disorder found significant positive effects on both expressive and receptive language outcomes compared to no treatment, with the largest effects seen in expressive language (Fan et al., 2022). A 2023 systematic review and meta-analysis of oral language interventions for children with neurodevelopmental disorders, including DLD, Autism Spectrum Disorder, Down syndrome, and intellectual disability, confirmed that language interventions produce meaningful improvements in language outcomes across diagnoses (Donolato et al., 2023).

Critically, these gains are durable. A 2023 systematic review and meta-analysis specifically examining the long-term effects of early communication interventions found that the benefits of early intervention persist over time and do not fade once therapy ends. The durability of gains was associated with the magnitude of immediate effects and the involvement of caregivers as intervention implementers (Pak et al., 2023).

Evidence-based SLP intervention approaches include (Donolato et al., 2023; Pak et al., 2023; Leafe et al., 2025):

• Naturalistic language intervention: Language teaching embedded within everyday play and routines. This is the most developmentally appropriate and ecologically valid approach for young children (Donolato et al., 2023).
• Enhanced Milieu Teaching (EMT): A naturalistic, caregiver-mediated approach with strong evidence for improving vocabulary and early language in toddlers and preschoolers (Pak et al., 2023)
• Focused stimulation: Repeated, emphasized exposure to target words or language structures within meaningful activities, used for vocabulary and grammar targets (Fan et al., 2022)
• Phonological intervention: Structured approaches targeting the sound system of language, effective for speech sound disorders and foundational literacy (Rupert et al., 2023)
• Parent-implemented intervention: Training caregivers to use specific language facilitation strategies during daily routines, effective for expanding gains beyond the therapy session (Leafe et al., 2025)

8. What Parents and Caregivers Can Do at Home

The language environment a child experiences at home is one of the most powerful predictors of language development. Research consistently shows that the quantity and quality of language input, including how much parents talk to children, how responsive they are, and how often they read together, directly influences vocabulary growth and language outcomes (Pak et al., 2023; Leafe et al., 2025).

Evidence-supported strategies for building language at home (Pak et al., 2023; Leafe et al., 2025; Feltner et al., 2024):

• Talk more, all the time. Narrate what you are doing throughout the day, during diaper changes, meals, bath time, and errands. The sheer quantity of language a child hears predicts vocabulary development (Pak et al., 2023).
• Follow the child’s lead. Talk about what the child is looking at and interested in. Joint attention, which is shared focus on the same object or activity, is the optimal window for language learning (Donolato et al., 2023).
• Expand and extend. When a child says “ball,” respond with “Yes, the red ball” or “The ball rolled away.” Adding one or two words to what the child says models more complex language without overwhelming them (Leafe et al., 2025).
• Read together every day. Shared book reading is one of the highest-yield language activities available at any age. It introduces vocabulary, sentence structures, and narrative skills that are foundational for literacy (Pak et al., 2023).
• Reduce screen time for children under 2. Passive screen time does not support language learning. It displaces the face-to-face interaction that does (Feltner et al., 2024).
• Pause and wait. Give the child time to initiate and respond. Waiting communicates that you expect them to communicate, which is itself a powerful language prompt (Leafe et al., 2025).

9. Long-Term Outcomes: Why Early Intervention Matters

The consequences of unaddressed speech and language difficulties extend far beyond the toddler years. Children with developmental language disorder and untreated speech and language delays are at significantly elevated risk for a range of academic, social, and emotional difficulties that persist into adolescence and adulthood (Van Barreveld et al., 2025; Wilmot et al., 2024).

Academic outcomes: DLD is one of the strongest predictors of reading and literacy difficulties. Children with language disorders struggle with phonological awareness, the ability to hear and manipulate the sound structure of words, vocabulary, reading comprehension, and written expression. Without intervention and support, these difficulties widen over time rather than resolving (Van Barreveld et al., 2025).

Social and emotional outcomes: A 2025 systematic review of social-emotional functioning in children and adolescents with language disorders confirmed that DLD is associated with significantly higher rates of anxiety, depression, peer difficulties, loneliness, and reduced quality of life across development (Van Barreveld et al., 2025). Children with language difficulties often struggle to navigate social situations, understand humor and sarcasm, and express their emotions, and these challenges compound over time without appropriate support (Van Barreveld et al., 2025).

Mental health and wellbeing in adulthood: Adults with DLD report significant impacts on mental health and wellbeing, including difficulties in employment, relationships, and self-advocacy (Wilmot et al., 2024). Many adults with DLD did not receive adequate support in childhood, underscoring the critical importance of early identification and sustained intervention (Wilmot et al., 2024).

The case for early intervention is strong. The gains from early communication interventions are durable. They persist over time and reduce the risk of cascading difficulties in reading, social development, and emotional wellbeing (Pak et al., 2023). Every year of unaddressed language difficulty is a year of missed opportunity during the brain’s most plastic developmental period.

10. What Families Can Do

Family involvement is consistently identified as one of the most important factors in speech and language outcomes. Whether a child is receiving formal SLP services or families are working independently to support language development at home, the following actions make a meaningful difference (Pak et al., 2023; Leafe et al., 2025).

• Act early and do not wait. If you are concerned about your child’s speech or language, request a referral today. Research does not support watchful waiting. Earlier intervention produces better, more durable outcomes (Pak et al., 2023).
• Be present and engaged. Language development happens in conversation, not in front of screens. The most powerful thing a family can do is talk with their child about everything, all day long (Pak et al., 2023).
• Attend SLP sessions and learn strategies. Ask your child’s SLP to teach you the strategies they are using and how to carry them over into daily routines. Bath time, meals, car rides, and bedtime stories are all language opportunities (Leafe et al., 2025).
• Read every day. Daily shared book reading from infancy is one of the highest-yield language activities available at any age. Start before the child can talk and keep going through the school years (Pak et al., 2023).
• Advocate at school. If your child has a language disorder, they may qualify for school-based SLP services, an Individualized Education Program (IEP), or a 504 accommodation plan. Request an evaluation from the school district if needed (Van Barreveld et al., 2025).
• Connect with other families. Organizations like the American Speech-Language-Hearing Association (ASHA, asha.org) and RADLD (radld.org) provide family resources, support communities, and information about DLD specifically.

11. A Note for Clinicians

Speech and language delay is one of the most common developmental concerns encountered in pediatric primary care and one of the most frequently undertreated. Systematic developmental surveillance at every well visit, prompt response to parental concern, and a low threshold for SLP referral remain best practice (Feltner et al., 2024; Rupert et al., 2023).

The distinction between speech delay, language delay, and developmental language disorder has important clinical implications. DLD is not a phase. It is a lifelong neurodevelopmental condition affecting approximately 7 to 10 percent of children and associated with significant long-term impacts on academic achievement, mental health, employment, and quality of life. Children with DLD need sustained support through their entire education and often into adulthood (Van Barreveld et al., 2025; Wilmot et al., 2024).

The evidence base for speech-language intervention is strong. Multiple meta-analyses confirm that SLP intervention produces meaningful, durable improvements in language outcomes compared to no treatment, and that caregiver-implemented approaches extend these gains into the home and daily life contexts where language is actually used (Fan et al., 2022; Donolato et al., 2023; Pak et al., 2023; Leafe et al., 2025).

Hearing loss remains the most commonly missed cause of speech and language delay. Audiological evaluation should be part of every speech-language workup, not an afterthought. Similarly, bilingual children are frequently over-referred due to misunderstanding of typical bilingual development, or under-referred due to the assumption that limited English explains their language difficulties. Comprehensive assessment in both languages, when possible, is essential for accurate identification (Feltner et al., 2024).

12. References

1. Ali, S. A., El-Setouhy, M., Albasheer, O., Alqassim, A. Y., Muaddi, M. A., Jareebi, M. A., Mkeen, A. M., Alattas, K. K. M., Alshareef, G. M. A., Koko, R. F. I., Masmali, O. M. H., Julajil, F. M. A., Dalak, F. E. L., Hakami, R. A., & Alharbi, A. A. (2025). Sociodemographic, health, and environmental determinants of speech delay in children: A case–control study. Medicine, 104(34), e43817. https://doi.org/10.1097/MD.0000000000043817
2. Cappadona, I., Ielo, A., La Fauci, M., Tresoldi, M., Settimo, C., De Cola, M. C., Muratore, R., De Domenico, C., Di Cara, M., Corallo, F., Tripodi, E., Impallomeni, C., Quartarone, A., & Cucinotta, F. (2023). Feasibility and effectiveness of speech intervention implemented with a virtual reality system in children with developmental language disorders: A pilot randomized control trial. Children, 10(8), 1336. https://doi.org/10.3390/children10081336
3. Donolato, E., Toffalini, E., Rogde, K., Nordahl-Hansen, A., Lervåg, A., Norbury, C., & Melby-Lervåg, M. (2023). Oral language interventions can improve language outcomes in children with neurodevelopmental disorders: A systematic review and meta-analysis. Campbell Systematic Reviews, 19(4), e1368. https://doi.org/10.1002/cl2.1368
4. Fan, S., Ma, B., Song, X., & Wang, Y. (2022). Effect of language therapy alone for developmental language disorder in children: A meta-analysis. Frontiers in Psychology, 13, 922866. https://doi.org/10.3389/fpsyg.2022.922866
5. Feltner, C., Wallace, I. F., Nowell, S., et al. (2024). Screening for speech and language delays and disorders in children age 5 years or younger: An evidence review for the U.S. Preventive Services Task Force (Evidence Synthesis No. 234). Agency for Healthcare Research and Quality. https://www.ncbi.nlm.nih.gov/sites/books/NBK599717/
6. Leafe, N., Pagnamenta, E., Taggart, L., Donnelly, M., Hassiotis, A., & Titterington, J. (2025). What works, how and in which contexts when using digital health to support parents/carers to implement intensive speech and language therapy at home for children with speech sound disorder? A realist review. PLoS One, 20(5), e0321647. https://doi.org/10.1371/journal.pone.0321647
7. Pak, N. S., Chow, J. C., Dillehay, K. M., & Kaiser, A. P. (2023). Long-term effects of early communication interventions: A systematic review and meta-analysis. Journal of Speech, Language, and Hearing Research, 66(8), 2884–2899. https://doi.org/10.1044/2023_JSLHR-22-00711
8. Rupert, J., Hughes, P., & Schoenherr, D. (2023). Speech and language delay in children. American Family Physician, 108(2), 181–188. https://www.aafp.org/pubs/afp/issues/2023/0800/speech-language-delay-children.html
9. Van Barreveld, M., Scheper, A., Vissers, C., Duinmeijer, I., & Hakvoort, B. (2025). Social–emotional functioning and quality of life in language disorders: A systematic review of development from childhood to adolescence. International Journal of Language and Communication Disorders. https://doi.org/10.1111/1460-6984.70039
10. Wilmot, A., Boyes, M., Sievers, R., Leitão, S., & Norbury, C. (2024). Impact of developmental language disorders on mental health and well-being across the lifespan: A qualitative study including the perspectives of UK adults with DLD and Australian speech-language therapists. BMJ Open, 14(10), e087532. https://doi.org/10.1136/bmjopen-2024-087532

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