But what exactly is the essential nature of boys? Even as infants, boys and girls behave differently. A recent study at Children’s Hospital in Boston found that boy babies are more emotionally expressive; girls are more reflective. (That means boy babies tend to cry when they’re unhappy; girl babies suck their thumbs.) This could indicate that girls are innately more able to control their emotions. Boys have higher levels of testosterone and lower levels of neurotransmitter serotonin(神经传递素), which inhabits aggression(睾丸激素) and impulsivity. That may help explain why more males than females carry through with suicide or become alcoholics.

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