The average age when most infants have mastered a skill or milestone is referred to as the

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The term "developmental norm" refers to the average age at which most infants have mastered a specific skill or milestone, such as crawling or walking. This norm serves as a general guide for parents and healthcare professionals to track a child's development. The term "normative curve" refers to the distribution of ages at which infants typically master a specific skill, rather than the average age itself. The term "modal norm" is not commonly used in developmental psychology. The term "growth period" refers to a broader time frame during which many developmental milestones may occur, but does not specifically refer to the age at which a skill is typically mastered.

The Average Age When Most Infants Have Mastered a Skill