I can say right away that personality type, at least from what I have discerned, is visible very early on whether a child is for example introverted or extraverted, for example. It was obvious I was an introverted child very early on. I don't think a person becomes an INFP in response to external pressure. However, I think that an INFP will perhaps experience this external pressure more than a different type possibly would.
I think this thread suffers from poor causation.