Parenting isn't a one-way street. A child's inherent temperament (e.g., ADHD, agreeableness) actively shapes parental reactions. This creates powerful feedback loops where, for instance, a difficult child elicits stricter parenting, which in turn affects development. The outcome is often misattributed solely to the parenting style.

If ADHD is a response to environmental stress, the logical first step is not medication but parental guidance therapy. This 'inconvenient truth' shifts responsibility to parents to examine family dynamics and psychosocial stressors as the root cause before medicating a child's symptoms.

Parents obsess over choices affecting long-term success, but research suggests these have minimal effect on outcomes like personality. Instead, parenting profoundly shapes a child's day-to-day happiness and feelings of security, which are valuable in themselves and should be the primary focus.

ADHD symptoms are framed not as a neurological disorder, but as a physiological stress response. The 'Attention-Deficit' is the 'flight' (distraction) and 'Hyperactivity' is the 'fight' (aggression) from an over-activated nervous system, often triggered by early childhood stress.

Countering the idea that parenting has little effect on outcomes, a twin study found that the twin receiving slightly more maternal affection between ages 5-10 grew up to be more open, conscientious, and agreeable. This suggests that small, differential parenting choices have measurable long-term consequences for personality.

Over the same decades that children's independent play has declined, rates of youth anxiety and depression have steadily risen. Unsupervised play is crucial for developing an "internal locus of control," which allows kids to learn they can handle life’s challenges and builds resilience.

Attributing traits to either genetics or environment is a false dichotomy. As the genetic disorder PKU shows, outcomes depend on the *interaction* between the two. Believing a trait is purely "in our genes" wrongly dismisses the power of environmental interventions, which can completely alter outcomes.

Early stress over-activates the amygdala (the brain's stress 'on' switch) while stunting the hippocampus (the 'off' switch). This creates a neurological imbalance of 'all gas, no brakes,' resulting in a state of hypervigilance and dysregulation that is often diagnosed as ADHD.

Fears about unintended trade-offs from embryo selection are largely unfounded due to 'positive pleiotropy.' The genes for many diseases are positively correlated. This means selecting against a disease like severe depression often provides a 'free' reduction in the risk of other conditions like bipolar disorder and schizophrenia.