So there are the typical milestone books out there, What to expect at 10 days, 3 months, 37 months. But so far, I have not come across a book that chronicles the crying milestones.
The first time you cry from hurt feelings
The first time you cry from seeing injustice happening in front of you or on a news report
The first time you realized that you are going to die someday....
The first time a movie makes you cry.
Those milestones are different for everyone, but they are on a chart somewhere inside all of us.