I nearly 40, and I literally just cried over something an hour ago. Does that make it the most traumatic event in my life? Sometimes I get so frustrated that I cry as well. What makes me different than a baby?

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I get that you are exploring thought, and that's cool. But it might help you to understand a bit more quickly if you just read a book on child psychology. There are people who spend their entire lives watching and documenting the development of children.  They have a lot to say on the matter and they have empirical data to back it up.