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Your baby starts out as a fertilized egg, no bigger than the period at the end of this sentence. The baby will change and grow almost every single day and your body will change and grow, too. It will take 280 days (9 1/3 calendar months or 40 weeks) before the baby is fully developed and is ready to live outside your uterus (womb). Pregnancy is often divided into three periods called trimesters. Each trimester is roughly three months long (More)

Understanding Pregnancy

  • The Menstrual Cycle and Ovulation
  • Myths & Truths About The Ways Pregnancy Can Occur
  • First Trimester
  • Second Trimester
  • Third Trimester
  • Prenatal Care
  • Lamaze Classes
  • How Do I Know When I'm in Labor? (Patient Education Materials)
  • Kangaroo Care
  • Doula Services
  • (More)

  • Commonly Asked Questions

    View All Q&As

  • Common Questions About Being Pregnant
  • Frequently Asked Questions About Pregnancy
  • How Do I Calculate When I Am Ovulating? - (American Pregnancy Association)

  • Additional Information

  • Symptoms and Tests
  • Treatment
  • Complications
  • The Body
  • Research Studies
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    NetWellness Expert Jonathan  A Schaffir

    Jonathan A Schaffir, MD
    The Ohio State University

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    Last Updated: Nov 06, 2015