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Body facts

Your body, by the numbers

  • Every egg in our bodies is created before we are born. When we're in the womb, we have about 7 million eggs in our ovaries. At birth, this has already dropped to 2 million. By puberty, about 400,000
    are left, and 5000 will be released as we age1.
  • Most girls get their first period between the age of 10 and 162.
  • It's perfectly normal to have irregular periods up to the age of 18. It’s a bit like your body taking time to find its own rhythm3.
  • A normal period usually releases 10 to 80 milliliters of blood. That’s as much as a teaspoon, right up to ¼ the size of a regular cola can4.
  • About 7 in 10 of us use tampons for our periods5.
  1. 1 Daniels, Patricia, et al. 2007. Body: The Complete Human. Washington, D.C.: National Geographic Society.
  2. 2 Livoti, Dr. Carol, and Elizabeth Topp. 2004. Vaginas: An Owner’s Manual. New York, NY: Thunder’s Mouth Press.
  3. 3 Redd, Nancy Amanda. 2008. Body Drama. New York, NY: Gotham Books.
  4. 4
  5. 5 Grahn, Judy. 1993. Blood, Bread, and Roses: How Menstruation Created the World. Boston, MA: Beacon Press.

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