THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Menarche is defined as the first menstrual period in a female adolescent. Menarche typically occurs between the ages of 10 and 16, with the average age of onset being 12.4 years.

Detailed explanation-2: -Most girls start their periods when they’re about 12, but they can start as early as 8, so it’s important to talk to girls from an early age to make sure they’re prepared. Respond to questions or opportunities as they arise and do not be embarrassed. Periods are natural.

Detailed explanation-3: -Menarche. Despite variations worldwide and within the U.S. population, median age at menarche has remained relatively stable-between 12 years and 13 years-across well-nourished populations in developed countries Box 1 2 3.