Final answer:
Connor should not worry, as breast enlargement during puberty for boys is typically normal and temporary due to hormonal changes.
Step-by-step explanation:
Connor, who is experiencing enlargement of his breasts during puberty, must not worry because this is normal and temporary. This condition, known as gynecomastia, can occur during puberty when hormonal levels fluctuate. While the primary sexual characteristics develop, such as growth of testes and onset of sperm production, secondary sexual characteristics, including breast tissue development in boys, may also occur. Breast enlargement in adolescent boys is usually a benign and temporary condition.