Re: Do periods happen after hair starts growing on the site?

Chica,
In the development of the female reproductive system at the time of onset 
of puberty a progression of three events generally proceed in the 
following order:  (1) thelarche, which refers to the beginning of breast 
development and generally starts a few months to a year before, (2) 
pubarche, which refers to the development of hair on the mons pubis and 
labia majora (genital hair).  About a year after the start of pubarche, 
give or take a few months, (3) menarche will start, which is the 
beginning of having menstrual periods (the loss of the inner lining of 
the uterus with associated bleeding).  This order may not always be the 
same for every girl but the majority of girls will experience puberty in 
this order.  The genital hair may be rather short, thin, and straight at 
the time that menstruation starts to occur even though it will become 
more adult in length, thickness and curliness after a year or two.  The 
same applies to breast development such that the nipples begin to enlarge 
first (called breast budding) and then the areolar surface (the pink area 
around the nipple) begins to enlarge as the milk producing cells of the 
breast then begin to grow and have fat deposited within that tissue 
giving the final enlargement of a normal breast.  Even  the menstrual 
periods do not always start out in regular 28-day spacing over the first 
year.  They can actually be spaced several months apart during the first 
year and some research indicates that during this first year of having 
periods, sometimes the ovary doesn’t produce an ovulated (released) egg 
to be fertilized.  However, generally by the second year of having 
periods the cycle settles down, becoming regular and always producing an 
egg each month for most girls.  Of course I am using the term month 
loosely because the normal cycle is 28 days so that most women will have 
about 13 periods per year if not pregnant.  So you can see that the whole 
process of puberty can take about two to three years from breast budding 
to having regular periods.  For most girls this process starts between 9-
12 years of age and is completed between 11-15 years of age.  After 
everything is in place and able to function, there is still a few years 
of growth and maturation of all the various parts.  The whole process can 
be delayed by poor nutrition (low body fat) or strenuous exercise like in 
individuals that train and compete at or near an Olympic level.