By about 14 months, 90% of children are able to stand well alone. This is known as

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A developmental norm refers to a milestone or an average age by which most children show a particular skill or behavior. The statement that by about 14 months, 90% of children are able to stand well alone, is an example of a developmental norm, indicating the typical age range by which this ability is expected to emerge in most children.

By About 14 Months, 90% of Children Are Able to Stand