A6-year-old child has been wetting the bed at night since the birth of a baby brother. what defense mechanism is the child using to cope with the stress of accepting a new family member?

The correct answer is regression.
The child is regressing to a previous age when he used to wet the bed. He is now six years old, so he is supposed to be old enough not to wet the bed anymore, which was the case until his baby brother was born. Now the older child feels neglected and starts regressing to an earlier age in order to be noticed by his parents again.

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