Which defense mechanism is observed when a child begins using "baby talk" and bed-wetting after the birth of a sibling?

The scenario presented involves a child reverting to earlier behaviors, such as using "baby talk" or experiencing bed-wetting, after the arrival of a new sibling. This behavior is a classic example of regression, a defense mechanism where an individual returns to behaviors typical of an earlier stage of development.

In this case, the child may feel insecure or threatened by the arrival of a new sibling and unconsciously seeks comfort through familiar behaviors that were previously abandoned. Regression often occurs in response to stress or anxiety and is particularly common in children who may lack the coping skills to process their emotions adequately. By regressing to earlier behaviors, the child attempts to regain a sense of security and nurturing that they associate with infancy.

Recognizing the importance of regression in developmental psychology provides insights into how children adapt to changes in their environment, especially in familial dynamics. Understanding this mechanism can help caregivers respond appropriately to the emotional needs of a child experiencing such changes.