Menarche
Menarche is the name given to the time when a girl has her first period. The age at which this happens varies from person to person. In Western society most girls experience the menarche between the ages of 10 and 14 years. This age has been dropping for several years, probably due to improved nutrition and better social conditions.
Before their first period arrives, most girls will have shown the early signs of puberty — the beginnings of breast development and fine hair growth in the pubic region and axilla (armpit). If signs of puberty begin much earlier, before age 8 for girls, it is called precocious puberty. This may be normal for that individual, or it may be a sign of underlying hormonal problems, so it’s best to get children with very early puberty reviewed by their doctor.
It is uncommon for a regular menstrual cycle to follow the first period. Periods tend to occur in a haphazard way for the first year or 2 before settling into a regular pattern, which is usually once every 24 to 30 days.
Some girls experience their first period without knowing what it is. To suddenly find blood in your underpants, or on your bed, is a frightening experience. For this reason it is important for parents to prepare their daughters, in advance of the menarche, for the changes associated with growing up.
Last Reviewed: 10 October 2008
