Developmental Delay vs Developmental Concerns: The Difference

Two terms come up constantly in early childhood support, and they are easy to mix up: developmental delay and developmental concerns. They sound almost the same, but in the NDIS they mean different things and lead to different pathways. Getting them straight saves a lot of confusion, so this article defines each and explains the test that sits underneath them.

Developmental delay is a defined term

Developmental delay is not a loose description; it has a specific meaning. It means a young child finds everyday things much harder than other children their age, and needs extra help to do the things their peers manage. To meet the NDIS early intervention requirements for developmental delay, a child must be below a set age and their presentation must meet the definition set out in the NDIS Act.

Underneath the definition sits a concrete test.

Under the NDIS early intervention requirements, a child younger than 6 with developmental delay needs specialist services from more than one professional working as a team for longer than 12 months. As of 2026-07-20 · Early intervention requirements - NDIS

That test is doing real work. It is not enough for a child to be behind in one area; the criteria describe a level of need that calls for coordinated, multi-professional support over time. Evidence from a child’s doctor, specialist or treating professional is what shows it.

Developmental concerns is broader

Developmental concerns is the wider term. It describes delays in a child’s development that do not meet the NDIS definition of developmental delay. A child can have real, worth-addressing developmental concerns and still fall outside the narrower legal definition, and that is not a dead end.

Children with developmental concerns can get help through early connections and early supports, without necessarily becoming an NDIS participant. In other words, the answer to concerns is support of a different shape, not the absence of support.

Why the difference matters

The reason to keep the two terms apart is that they open different doors. Developmental delay can point toward the NDIS early intervention pathway, described in the NDIS eligibility for children article. Developmental concerns points toward early supports through the early childhood approach, often without a plan. Knowing which term a professional is using tells a family which pathway they are actually on.

Neither term is something to self-diagnose from a definition. Which one fits a child is a matter for the child’s treating professionals and, for the NDIS pathway, for the NDIA. The official early intervention requirements page carries the current wording of the test.