Developmental Delay: Warning Signs by Age | Parenting Hub
Early support changes outcomes. Here are the key 'red flag' signs at every age — and how to start a developmental assessment in Australia.
If something feels off, trust your gut. Australia has free MCH nurse checks at set ages plus GP referrals to paediatricians, speech pathologists and OTs. The earlier the support, the bigger the difference.
Red flags by age
Any one sign isn't a diagnosis — but it's a reason to get a check.
- By 3 months: not responding to loud sounds, not focusing on faces, very stiff or very floppy
- By 6 months: not smiling, not reaching for objects, not making vowel sounds
- By 12 months: not babbling, no gestures (waving, pointing), no response to name, not bearing weight on legs
- By 18 months: no single words, not walking, no pretend play, no eye contact
- By 2 years: no 2-word phrases, doesn't follow simple instructions, doesn't notice other children
- By 3 years: speech mostly not understood by strangers, no pretend play, doesn't run, no interest in peers
- Any age: loss of a skill they used to have (regression)
Where to start in Australia
- Maternal and Child Health (MCH) nurse — free key-age checks 0–3.5 years
- GP — for referral to paediatrician, speech pathologist or occupational therapist
- Audiologist — always rule out hearing loss for any language concern
- NDIS Early Childhood Approach (under 9 years) — supports children with developmental delay or disability, no diagnosis required to start
Why early support matters
The first 5 years are when the brain is most plastic. Early intervention for delays in speech, motor or social skills produces better outcomes than waiting. Asking for an assessment is never an over-reaction.
When to seek help
- Loss of any previously gained skill
- No eye contact and no response to name by 12 months
- No words by 18 months
- Major motor delays at any age
- Parent or carer gut feeling that something is off
Common questions
My GP said 'wait and see' but I'm worried — what now?
You can ask for a second opinion or self-refer to a private speech pathologist or OT. NDIS Early Childhood Approach also accepts self-referrals for children under 9.
Will an assessment 'label' my child?
An assessment opens the door to support — it doesn't lock anything in. Many children get short-term therapy and never need a diagnosis.