Nobody warns you about the goodbyes you have to make as a parent.

They warn you about the sleepless newborn nights. They warn you about the terrible twos and the teenage eye rolls. They give you books about discipline and development. What they do not give you is a heads up about the moment your child doesn't need you the way they used to, and the confusing, slightly embarrassing, but very real grief that follows.

In her book, It. Goes. So. Fast., Mary Louise Kelly, the host of NPR’s All Things Considered, shares her poignant journey of authoring her oldest son's last year living at home before heading to college.