it's been known for a while that oxytocin helps the brain grow

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>Emerging evidence shows that, during early brain development, oxytocin helps to organize neural circuits in the brain and that these organizational effects may help the brain develop the capacity to execute sex-specific and context-appropriate social behaviors later in life.

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so if oxytocin and a stable environment isn't there it's kind of obvious that the persons brain would develop differently or be more geared towards flight or fight.