1. Physical Changes in Girls
Growth spurt Breasts develop
Skin becomes oily
Hips widen
Waistline narrows
Underarm hair appear
Pubic hair appear
External genitals enlarge
Ovulation occurs (may or may not)
Menstruation begins

2. Physical Changes in Boys
Pubic hair appear
Facial hair appear
Penis and testes enlarge
Sperm production begins
Ejaculation occurs
Growth spurt Muscles develop
Skin becomes oily
Shoulders broaden
Voice deepens
Underarm and chest hair appear

3. Emotional and Social Changes
Need for attachment to a peer group.
Peer group defines behavioural code
Forms new relationships
Need for Independence
Need to establish own identity
Inquisitiveness
Increased energy levels
Changes in dress code