: The first sign is often breast budding (thelarche), followed by the first menstrual period (menarche).
: Mature girls experience dynamic levels of hormones like estradiol and progesterone, which regulate reproductive cycles. mature girls
: Biological maturation involves increases in percentage body fat, changes in body size and shape, and the completion of bone mass formation. : The first sign is often breast budding
Physical maturity typically begins with puberty, a period of rapid biological change. changes in body size and shape
: For girls, this usually occurs between ages 8 and 13.
