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At birth, the brain is the most underdeveloped organ in our body. It takes up until our mid-20s for our brains to fully mature. Any serious and prolonged adversity, such as a sudden, unexpected and lasting separation from a caretaker, changes the structure of the developing brain. It damages a child’s ability to process emotion and leaves scars that are profound and lifelong.

That’s bad news because, although President Trump has ended his “zero-t...