Shortly after her daughter is born, anna's three-year-old son wants to start sleeping in the crib again. this is an example of

The example shown above of which the three year old son wants to sleep in the crib again is regression. Regression in psychology is being defined as of having to show a defense mechanism because of the reason that an individual is having difficulty of facing unacceptable impulses such as the son wanting to sleep on the crib because of having to see that the son was now having a younger sister that is going to sleep on the crib.

its d i know cause i've been googling it

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