Richard Tremblay argues that the best time to prevent aggressive behavior is when the criminal is still in his mother’s tummy. Tremblay points to a cluster of risk factors involving the mother that predict a child’s chronic physical aggression: maternal poverty, smoking, malnutrition, anger, and depression, plus poor marital relations, low education, and having the baby as a teenager. These factors tend to come together, according to Tremblay—and more important, they can be changed. Tremblay is currently working on a program that helps pregnant women in these high-risk situations. “To solve
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