Period of adolescent growth in boys is:
High-Yield Explanation
Key Concept:
The stages of sexual development in boys are more difficult to specifically define than in girls. Puberty begins later and extends over a longer period-about 5 years compared with 3 1/2 years for girls.
Adolescent Growth Stages Versus Secondary Sexual Characteristics:
Girls:
Total Duration of Adolescent Growth: 3 ½ years
Stage 1
Beginning of adolescent growth
Appearance of breast buds, initial pubic hair.
Stage 2 (About 12 months later)
Peak velocity in height
Noticeable breast development, axillary hair, darker and more abundant pubic hair.
Stage 3 (12-18 months later)
Growth spurt ending
Menses, broadening of hips with adult fat distribution, breasts completed.
Boys:
Total Duration of Adolescent Growth: 5 years
Stage 1
Beginning of adolescent growth
“Fat spurt” weight gain, feminine fat distribution.
Stage 2 (About 12 months later)
Height spurt beginning
Redistribution and reduction in fat, pubic hair, growth of penis.
Stage 3 (8-12 months later)
Peak velocity in height
Facial hair appears on upper lip only, axillary hair, muscular growth with harder, more angular body form.
Stage 4 (15-24 months later)
Growth spurt ending
Facial hair on chin and lip, adult distribution and color of public and axillary hair, adult body form.
Ref: Contemporary orthodontics Proffit 6th ed page 150