Adolescence Physical Development

Adolescence

Developmental stage between childhood and adulthood.

Growth spurt

Rapid physical growth during adolescence.

Weight gain in boys

Boys typically gain over 20 lbs.

Weight gain in girls

Girls typically gain 10-15 lbs.

Height gain in boys

Boys grow 4-6 inches during adolescence.

Height gain in girls

Girls grow 2-4 inches during adolescence.

Distal/proximal development

Growth sequence: extremities to torso.

Puberty

Process of becoming sexually mature.

Menarche

First menstrual period, average age 12.5 years.

Menarche age range

Normal onset age is 9-16 years.

Racial differences in menarche

Onset varies across different ethnic groups.

Sperm appearance

Boys show live sperm around 13-14 years.

Secondary sexual characteristics

Changes from increased sex hormones, not reproduction.

Breast development

Occurs in both sexes during puberty.

Voice change

Deepening of voice due to larynx enlargement.

Hair changes

Hair becomes darker and coarser in puberty.

Pubic hair

Development of coarse hair in the pubic region.

Axillary hair

Growth of hair in the underarm area.

Facial hair

Development of hair on the face during puberty.

Chest hair

Growth of hair on the chest in males.