Delays in speech development

Delays in speech development are common. Estimates vary with how a delay is defined, but they are often cited at roughly 5 to 10 percent of young children [add citation], which makes them one of the most frequent developmental concerns parents of toddlers raise. A speech delay means a child’s spoken language skills are noticeably behind what is typical for their age, whether that shows up as fewer words, harder-to-understand speech, or difficulty putting sentences together. Some delays resolve naturally as the child matures, and slow speech development is sometimes simply a late talker on their own timeline. Others need professional support. And in some cases, what looks like a general delay is actually early developmental stuttering, which is a different pattern from a speech delay. Knowing what to watch for, and when to seek help, is the difference between waiting when you should act and worrying when you should not. If stuttering is your main concern, our guide on how to stop stuttering, our online stuttering therapy, and the neuroscience method behind our program are good places to start.

What Is a Speech Delay?

A speech delay is when a child’s spoken language skills are behind the expected range for their age. It is different from a language delay. Speech is about how sounds and words are produced, and language is about understanding and using words and sentences. Some children have one, some have both, and the two often show up together.

There are two main types worth knowing, and many children have a mix of both. Expressive delay is when a child understands more than they can say. Receptive delay is when a child struggles to understand what is said to them. Our post on receptive vs expressive language explains the difference in more detail. Expressive delays are more common, while receptive difficulties can point to a broader issue and are usually looked at sooner.

There is also normal disfluency to consider. Between the ages of 2 and 5, many children repeat sounds or words, pause mid-sentence, or stumble as they learn to speak, which is part of normal speech disfluencies. Most of this is completely normal and clears up on its own. When it does not clear up, it may be the early sign of a different pattern.

What Is Considered Delayed Speech?

There is no single cutoff, because children develop at different rates. Speech is generally considered delayed when a child is clearly behind the typical range for their age in several ways. For example, they may say far fewer words than other children their age, not combine words when expected, be much harder to understand than expected, or not seem to understand what is said to them. One missed milestone is not necessarily a delay, but a pattern is worth raising with your pediatrician, and so is any loss of skills. Our guide to the signs of speech delay in toddlers can help you tell what stands out.

Speech Milestones vs Signs of Delay by Age

Here is a rough guide to what typical speech development looks like in babies and toddlers, and what may suggest a delay. Milestones vary from child to child, and a range is normal, so treat this as a guide and not a test. For a broader overview, see our post on child speech development.

By 12 months: A child usually says a few simple words like “mama” or “dada” and babbles with recognizable tones. A delay may show as no babbling, no attempts at words, and little response to their own name.

By 18 months: Most children say several words and can point to familiar objects when named. A delay may show as very few words, no pointing, and limited effort to communicate.

By 2 years: Many children use around 50 words and begin combining two words, such as “more milk” or “want cookie.” A delay may show as no phrases, unclear speech that even parents cannot understand, and frustration around communication. If your toddler babbles a lot but is not yet saying words, see our post on a 2-year-old not talking but babbling.

By 3 years: Most children speak in short sentences and are understood by strangers much of the time. A delay may show as one-word answers only, speech only family can understand, and difficulty following simple directions. We cover this age in more detail in our guide to a 3-year-old speech delay.

By 4 years: Speech is usually clear enough for most people to understand, and children can tell simple stories. A delay may show as ongoing sound errors, missing words in sentences, or difficulty with basic story structure.

Common Causes of Delays in Speech Development

There is no single cause. Speech delay can come from several different sources, and often more than one at the same time. For a longer discussion, see what causes delay in speech.

Hearing issue:
Hearing loss, even mild or temporary, can affect speech development. Chronic ear infections are a common cause of temporary hearing loss and can go unnoticed until a hearing test is done.

Late talker pattern:
Some children simply develop later than others with no underlying issue. Many late talkers catch up without therapy, but some do not, and it is hard to tell early on which children will.

Autism spectrum:
Speech delay is one of the early signs parents often notice in autism, though it is far from the only cause. Autism-related delays usually come with other patterns like limited eye contact, reduced social interest, or repetitive behaviors. See our post on speech delay vs autism for more.

Cognitive or developmental delays:
Broader developmental delays often include speech delay as one part of a wider pattern.

Environmental factors:
Limited language exposure and reduced face-to-face interaction can slow speech development, especially in the first three years. Heavy screen time has also been linked to slower language development in some studies, though research shows a link, not proof of cause.

Speech and motor-planning conditions:
Some children have trouble coordinating the movements needed for speech, as in childhood apraxia of speech, and others have structural differences such as cleft palate. A speech-language pathologist can help sort these out.

Anxiety about speaking:
Some children talk freely at home but stay silent with strangers or at school. This can be selective mutism, a form of anxiety and not a speech delay. See our guide on how to get a child with selective mutism to talk.

Early developmental stuttering:
For some children, what appears as a delay is actually the early formation of a stuttering pattern involving repetitions, blocks, or prolongations. A child can have age-appropriate language and still stutter, and stuttering can also exist alongside a speech or language delay. This is one of the areas where early evaluation helps, and many children who start stuttering in early childhood do recover.

When Speech Delay Might Be Early Stuttering

Around 5 percent of children go through a period of stuttering, most often between the ages of 2 and 5, and for most of them it clears up on its own. For some children, the pattern settles in and continues into adulthood. About 1 percent of adults stutter. It is worth paying attention to signs that suggest something more than normal disfluency.

The simplest way to tell the two apart is this. A speech delay is mainly about how many words a child uses, how clearly they say them, or how well they understand. Stuttering is about the flow of speech: a child may know exactly what they want to say but get stuck saying it.

Signs that may indicate early stuttering rather than delay include repeated sounds or syllables on the same word (“m-m-m-milk”), visible physical tension in the face or neck when trying to speak, blocks where no sound comes out, and frustration or avoidance around specific words. You do not need to wait until age 4 to ask for an evaluation. Consider one if the stuttering has lasted for several months, is getting worse, comes with tension or frustration, or runs in the family, since stuttering often has a genetic link. A pediatric speech-language pathologist can tell you whether to wait and watch or start support. For age-specific guidance, see our posts on toddler stuttering and why kids start stuttering.

Early attention is generally recommended because young children tend to respond well to early support, and families get clarity sooner.

When to See a Professional

Speech delay does not always need intervention, but there are red flags that warrant a proper evaluation.

• No babbling by 12 months

• No single words by 16 months

• No two-word combinations by 24 months

• Any loss of previously acquired speech skills at any age

• Speech that is very difficult to understand past age 3

• Stuttering that lasts for several months, is getting worse, or comes with tension or frustration

• Any concern about your child’s hearing

• Signs of frustration, avoidance, or communication shutdown

Start with a pediatric hearing test to rule out hearing loss. If that is clear, a speech-language pathologist can provide a proper evaluation. In the US, you can also request a free or low-cost evaluation through your state’s early intervention program for children under 3, usually without a doctor’s referral. Not sure whether to book? Our guide on whether your child needs speech therapy can help you decide. To learn what treatment can involve, see treatment for speech delay and pediatric speech therapy. For children showing early stuttering patterns specifically, look for a speech-language pathologist with experience in early childhood stuttering and ask what approach they use and what evidence supports it. Our online speech therapy for kids is a paid service and one option among several.

How to Support Speech Development at Home

Whether or not your child has been formally evaluated, there are practical things every parent can do to support speech.

Talk to them constantly:
Narrate your day. Describe what you are doing while you cook, drive, or fold laundry. Children learn language from hearing it in real context.

Read aloud every day:
Even a few minutes matters. Point to pictures. Name objects. Ask simple questions. Reading builds vocabulary and rhythm together.

Limit screen time in the early years:
Screens usually do not offer the back-and-forth that speech develops through. Live conversation and play do.

Sing songs and nursery rhymes:
Music helps children learn rhythm, sound patterns, and word structure without pressure.

Follow their interest:
If they are looking at a truck, talk about the truck. Speech develops fastest when it is tied to what a child is already paying attention to.

Give them time to respond:
Do not rush. Some children need several extra seconds to form a word. Filling the silence for them can slow their progress.

If your child stutters, stay calm and slow down your own speech:
Avoid finishing their words or saying “slow down” or “take a breath.” Listen patiently, keep eye contact, and speak slowly and simply yourself. Our stuttering handouts for parents have more tips you can use at home.

Frequently Asked Questions

At what age is speech delay in toddlers concerning?

Speech delay becomes concerning if a child is not babbling by 12 months, saying single words by 16 months, or combining two words by 24 months. Any loss of previously acquired speech skills at any age is also a red flag worth immediate attention.

What is considered delayed speech?

Speech is considered delayed when a child is clearly behind the typical range for their age, for example using far fewer words, not combining words when expected, or being much harder to understand than other children their age. A single missed milestone is not necessarily a delay, but a pattern is worth discussing with a pediatrician or speech-language pathologist.

What are the types of developmental delays?

There is no single official list of three. Developmental delays are commonly grouped by area: speech and language, motor skills (gross and fine), cognitive skills, social-emotional skills, and adaptive or self-care skills. Within speech and language, delays are often described as expressive, receptive, or a mix of both. A child with delays in several areas may be described as having a global developmental delay.

Can a child have a speech delay and not be autistic?

Yes, most children with speech delay are not autistic. Common non-autism causes include hearing issues, late talker patterns, environmental factors, and speech-motor conditions. Autism-related delays typically come with other social and behavioral signs beyond speech alone.

What is the most common cause of speech delay?

Often no single cause is found. Common contributors include being a late talker, hearing problems, and limited language interaction, and a pediatrician or speech-language pathologist can help identify what applies to your child. Autism, cognitive delays, and speech-motor conditions account for smaller but important shares of cases.

Can a speech delay turn into stuttering?

A speech delay is not known to directly cause stuttering, but the two can overlap, and some toddlers who seem delayed are actually showing early stuttering signs, such as repeating sounds, getting stuck on words, or avoiding talking. If these patterns last for several months, get worse, or come with tension, an evaluation is worth it. See our post on stuttering in 4-year-olds for what to expect at older preschool ages.

Final Thoughts

Delays in speech development are common, and most improve well when addressed early. The key is knowing what is normal, what is worth watching, and when to seek help. Some children need nothing more than time and consistent, warm interaction at home. Others benefit from a proper evaluation and targeted support. And for the specific subset where early stuttering is emerging, an early evaluation helps families understand their options. Many children recover, and some continue to stutter. Whatever the underlying cause, the earlier you understand what you are working with, the more choices you have.