Puberty usually starts at about 12 or 13 years of age. In one well- documented case, menstruation and breast development began in a baby of 18 months.
A female child at birth has somewhere between 40,000 and 300,000 ova, of which only about 500 will ripen.
At the moment of conception some 350 million spermatozoa are deposited around the cervix, yet something less than 100 get near the female egg.
Despite surgery to control her growth, Sandy Allan, a Young woman from Indiana, USA, has grown to an amazing 7 ft 7in.
A Dutch woman, Pauline Musters grew to full maturity with a height of just 23 inches.
The average length of pregnancies all over the world from any culture will show a remarkable consistency. A pregnancy producing a male child - will be almost exactly one day less than a pregnancy producing a female child.