The Human Body and Development

Menstruation definition

Menstruation onset

Underarm and genital hair growth

Breast development

Increase in height and weight

What to expect from puberty in girls

Puberty is one of the most important stages of every person's life.

Puberty is the process that boys or girls undergo to become adults and sexually mature; in essence, the period from childhood to adulthood. Puberty involves a series of physical changes in both boys and girls that lead to the development of secondary sex characteristics, the physical features associated with adult males and females (such as the growth of pubic hair).

The cycle for menses is usually around 28 days but can vary from 21 to 35 days. Each cycle involves the release of an egg (ovulation), which moves into the uterus through the fallopian tubes. The body’s tissues and blood start to line the walls of the girl ’s uterus for fertilization.

Menstruation is the monthly flow of blood from the uterus through the vagina in girls and women from puberty to menopause. It is a normal process for women and girls, and it starts at puberty or adolescence. Girls tend to start their menstrual periods between the ages of 10 and 14, and this continues until they reach menopause usually between their late forties to mid mid-fifties.