My 19-year-old moved across the country with 4 days' notice. What he packed made it easier to let him go.

The author's son (not pictured) brought his teddy with him when he went to college. FatCamera/Getty Images My oldest son told me on a Monday that he was moving 3,000 miles away that Thursday. I understood his need to leave because I'd made a similar move at the same age. When I visited his new…