What physiological change occurs during puberty in girls?

During puberty, girls experience a range of physiological changes driven by hormonal fluctuations, particularly an increase in estrogen production. Among these changes, breast development is a prominent and significant marker of sexual maturity. This development occurs due to the growth of glandular tissue and fat deposits in the breast area, preparing the body for potential future breastfeeding.

Breast development is often one of the first visible signs of puberty in girls, usually beginning around 8 to 13 years of age. This process is accompanied by other changes such as the broadening of hips and the start of menstruation, but breast development itself plays a crucial role in the overall physical and reproductive maturation of the female body. Understanding these changes provides insight into the complexities of adolescent development and the important biological roles that hormones play during this critical period of growth.