Which developmental milestone is demonstrated by looking for a hidden object after it is covered?

• A. Separation anxiety
• B. Object prehension
• C. Associative play
• D. Object permanence

Answer: (D)

Object permanence is the understanding that an object continues to exist even when it is out of sight. When a child searches for a toy after it has been covered, they are showing this mental representation—that the toy still exists somewhere and has a specific location. This milestone develops during the sensorimotor period, typically appearing around 8–12 months and becoming more robust by about 12–18 months. It is a foundational step for memory and later symbolic thought.

This behavior isn’t about separating from the caregiver (separation anxiety), nor about the ability to grab a visible object (object prehension), nor about social or complex play (associative play). It specifically reflects understanding that unseen objects continue to exist.