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Parent GuideA clear, age-by-age guide to speech and language milestones, the warning signs of speech delay, and what to do if you are concerned about your child's communication development.
By SpeechBuddy Team · Speech & Language Resources
A speech delay occurs when a child's speech or language development falls significantly behind the typical range for their age. It is one of the most common developmental concerns in early childhood — approximately one in five children will learn to talk or use words later than other children their age. The important thing to understand is that "delay" does not mean "disorder." Many children with speech delays catch up fully with appropriate support, particularly when that support begins early.
Speech delays can affect expressive language (what a child can say), receptive language (what a child understands), or both. They can also affect the clarity of speech sounds (articulation) or the fluency of speech (stammering). Each type of delay has different signs and different approaches to support.
The following milestones are based on guidelines from the American Speech-Language-Hearing Association (ASHA) and the National Institute on Deafness and Other Communication Disorders (NIDCD). Remember that these are ranges, not rigid rules — children develop at different rates, and a child who is slightly outside the typical range is not necessarily delayed.
| Age | Typical Speech & Language Development |
|---|---|
| By 12 months | Babbles with varied sounds ("bababa," "dadada"); uses gestures like pointing and waving; understands "no" and their own name; may say 1–2 words |
| By 18 months | Uses 10–20 words; points to show interest; follows simple one-step instructions ("Give me the ball"); identifies familiar objects in pictures |
| By 2 years | Uses 50+ words; combines two words ("more milk," "daddy go"); strangers can understand about 50% of what they say; follows two-step instructions |
| By 3 years | Uses 200–1,000 words; speaks in 3–4 word sentences; strangers understand about 75% of speech; asks "why" and "what" questions |
| By 4 years | Tells simple stories; uses sentences of 4–6 words; strangers understand almost all speech; uses past tense (mostly correctly) |
| By 5 years | Uses complex sentences; tells longer stories with a beginning, middle, and end; speech is fully intelligible to strangers; understands most of what is said to them |
The following signs suggest that a child may benefit from a speech and language evaluation. This is not a diagnostic checklist — only a qualified speech-language pathologist can diagnose a speech or language delay. But if you notice several of these signs, it is worth discussing with your child's paediatrician.
A child who is not babbling, not using gestures (pointing, waving, reaching), not responding to their name, or not making eye contact during interaction may warrant early evaluation. These are not just speech concerns — they can also be early signs of autism spectrum disorder, which is why early screening matters.
If a child is not yet using any words, is not pointing to show you things of interest, or does not seem to understand simple words like "no," "up," or the names of familiar people and objects, an evaluation is recommended. The American Academy of Pediatrics recommends autism screening at 18 months for all children.
A child who has fewer than 50 words, is not combining two words, is losing words they previously used (regression), or is very difficult for family members to understand should be evaluated. Regression — losing skills a child previously had — is always a reason to seek professional advice promptly.
By age 3, unfamiliar adults should be able to understand at least 75% of what a child says. By age 4, speech should be almost fully intelligible. If a child's speech is still very difficult to understand at these ages, or if they are struggling to form sentences or tell simple stories, an evaluation is appropriate.
Speech delays have many possible causes, and in many cases no single cause is identified. Common contributing factors include hearing loss (which is why hearing should always be tested when a speech delay is suspected), premature birth, neurological differences including autism spectrum disorder, oral motor difficulties, and a family history of speech or language delays. Environmental factors — such as limited language exposure or bilingual language learning — can also affect the timing of speech development, though bilingualism itself does not cause speech delay.
The most important step is to act early rather than waiting to see if your child "grows out of it." Research consistently shows that early intervention — ideally before age 3 — produces significantly better outcomes than intervention that begins later. The process typically looks like this:
Waiting lists for speech therapy can be long. In the meantime, there is a great deal you can do at home to support your child's communication development. Read to them daily, narrate your activities, offer choices, and create opportunities for them to communicate rather than anticipating their needs. SpeechBuddy's exercises are designed to support exactly this kind of daily practice, with activities covering vocabulary, pronunciation, sentence building, and more — all in a format children find engaging and non-threatening.
Speech delay is one of the most common early signs of autism spectrum disorder, but not all children with speech delays are autistic, and not all autistic children have speech delays. If you are concerned about autism as well as speech development, ask your paediatrician for a developmental screening. Early diagnosis of autism enables access to a broader range of support services, including speech therapy, occupational therapy, and applied behaviour analysis (ABA).
Free interactive speech exercises designed for children aged 2–8 with autism and speech delay — no account required to start.