Language delay is one of the most frequent reasons for paediatric and speech therapy consultations in early childhood. Understanding language development milestones and warning signs allows families to act in time — because early intervention is the most important predictive factor for outcomes in language disorders.
Learning
Language delay in children: warning signs, causes and when to seek help
Language development milestones by age
| Age | Comprehension | Expression | Warning sign |
|---|---|---|---|
| 12 months | Recognises own name; understands "no" | Varied babbling; possibly 1-2 words | No babbling; doesn't respond to own name |
| 18 months | Understands 50+ words | 10-20 words; points to named objects | Fewer than 6 words or no pointing |
| 24 months | Understands concepts (big/small) | 50+ words; 2-word combinations | Fewer than 50 words or no combinations |
| 36 months | Understands where/who/what questions | 3-4 word phrases; strangers understand ~75% | Fewer than 3-word phrases |
Causes of language delay
Causes include: normal developmental variation ("late bloomer" — late start but with preserved comprehension), hearing loss (most frequent organic cause — audiology testing is one of the first investigations), ASD (language delay or regression as an early sign), Developmental Language Disorder (DLD, 7-8% of school-age children), intellectual disability and environmental factors (insufficient verbal stimulation).
Warning signs requiring immediate referral
Urgent referral when:
- Loss of words or communication skills previously acquired (regression)
- No words at 16 months
- No 2-word combinations at 24 months
- Difficulty understanding simple instructions at any age
- Absence of protodeclarative pointing at 12 months
Early intervention: why it matters so much
The young child's brain has extraordinary neuronal plasticity that makes early interventions significantly more effective than later ones. The critical periods for language development (0-5 years) are windows of opportunity that, if used, allow much greater compensation. Early speech therapy, combined with family guidance for language stimulation in natural environments, is the approach with the greatest scientific evidence.
Frequently asked questions
Not in the clinical sense. Bilingual children may have slightly smaller vocabularies in each individual language, but their total vocabulary (adding both languages together) is equivalent to monolingual children. If a bilingual child shows signs of language delay, the cause is independent of bilingualism.
Research shows 80-90% of these children catch up between 2.5 and 3.5 years. If at 2.5 years the child has not begun combining words and has fewer than 50 words, speech therapy referral is recommended regardless of whether they are a "late bloomer" or not.
Want personalised guidance?
Take our free assessment and get a personalised neuropsychological profile in about 15 minutes.
Start free assessment