system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do children cry when they experience physical pain but adults rarely do.

For example, when I was maybe 6, I remember I tripped on the play ground and skinned my knee and cried a lot because of it.  When I was 28 I suffered a disfiguring multiple fracture hand break which was extremely painful, but I wasn't compelled to cry.  When and why did that change?
gpt
Crying is a response to helplessness, not pain.  A small child has a poor understanding of how to respond to the pain and needs the total care of a responsible adult.  An adult is typically able to self-assess the situation and determine what the necessary next steps are.  In this case, the responsible adult and the injured person are the same person.