A diagnosis (as per DSM-5) reserved for children up to 5 years of age that applies to children who are unable to undergo systemic assessments of intellectual functioning, including children who are too young to participate in standardised testing.
A diagnosis will only be made when a child doesn’t meet certain expected developmental milestones in several areas of intellectual functioning.
The diagnosis requires reassessment after a period of time. 
Global developmental delay is a condition on List D Permanent Impairment/Early Intervention, under 7 years.
 A child younger than 7 with a diagnosis of global developmental delay may be eligible to become a participant of the NDIS.