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Editor-In-Chief: C. Michael Gibson, M.S., M.D. 
The term Delayed milestone (or "developmental delays") is used to describe the condition where a child does not reach one of these stages at the expected age. However, in most cases, a wide variety of ages can be considered normal, and not a cause for medical concern.
Milestones are often measured using percentiles, and for many milestones a value between the 5th and 95th percentile does not require intervention, though values towards the edges of that range can be associated with other medical conditions.