Puberty is a developmental process by which a fully competent adult reproductive capacity is established.
In the US, it usually occurs in girls between 8 and 13 years of age, whereas in Nigeria between 9 and 13 years.
Physical changes in puberty
- Pubic hair growth
- Axillary hair growth
- Growth spurt
Breast budding (thelarche) is the first sign of puberty.
The time period between breast budding and menarche is an average of 2.5 years.
Factors affecting onset of puberty
- Race: earlier in blacks
- Bodyweight: earlier in obese
- Exercise: delays puberty
- Stress: delays puberty
- Altitude: earlier in those who live at low altitudes
- Environment: earlier in urban dwellers
- Blindness: puberty occurs earlier in blind girls