Which defense mechanism is characterized by behaving like a child in stressful situations?

The characteristic of behaving like a child in stressful situations aligns with the defense mechanism known as regression. This psychological response involves reverting to behaviors typical of an earlier developmental stage when faced with stress or anxiety. For example, an adult might throw a temper tantrum, sulk, or seek comfort in childish activities rather than coping with the adult responsibilities at hand. Regression serves as a temporary escapism from stressors, allowing individuals to reduce feelings of anxiety by returning to a time when they felt safer and less pressured.

In contrast, repression involves unconsciously blocking unwanted thoughts or memories, displacement redirects emotional responses from their original source to a safer target, and sublimation transforms unacceptable impulses into socially acceptable actions. None of these mechanisms directly involve the child-like behaviors that define regression, highlighting why regression is the most relevant choice in this context.