Wait for puberty and natural hormonal changes
Maintain a healthy body weight
Eat enough calories and nutrients
Reduce extreme exercise if you are overtraining
Manage stress
Sleep regularly
Track your cycle if it is already starting
See a doctor if you have not started by age 15 or within 3 years of breast development
See a doctor if you have severe weight loss, eating concerns, or intense exercise habits
See a doctor if you have symptoms of a hormonal or medical problem