I just read a thing about how narcissistic personality disorder can be a consequence of trauma, maladaptive coping, neurodivergence, and having material but not emotional needs satisfied.
One thing I'll definitely say about raising a kid, from my few months perspective, is there's an astounding lack of support. Like my expectations were already nil and somehow I've still been disappointed. Imagine being subjected to sleep deprivation torture for a year and your family is like "👀 anyway..."