Based on a two-year study that followed boys from pre-kindergarten through first grade, When Boys Become Boys offers a new way of thinking about boys' development. Through focusing on a critical moment of transition in boys' lives, Judy Y. Chu reveals boys' early ability to be emotionally perceptive, articulate, and responsive in their relationships, and how these "feminine" qualities become less apparent as boys learn to prove that they are boys primarily by showing that they are not girls.

Chu finds that behaviors typically viewed as "natural" for boys reflect an...