|

Calculating Your Due Date

The expected date of your baby's arrival is probably the biggest piece of news you'll take away from your first checkup. It's the date you'll memorize and engrave on your heart. Unfortunately, it's probably not the date your baby will arrive. The due date is nothing more than an estimate that gives you and your doctor an idea of when to expect your bundle of joy. Because the exact date of conception is almost impossible to pinpoint, and because babies have their own time schedule for arrival, you should use this date only as an indicator of when you might be due.

Your health-care provider will determine when your baby is due by using a handy little "due-date calculator" that figures out the date by simply targeting your last menstrual period. To do this calculation yourself, try one of two formulas:

  1. Take the date of the first day of your last normal menstrual period and add seven to it. To that date, add nine months. That's your estimated due date.
  2. Note the date of the first day of your last menstrual period. Add 40 weeks to this date. This could be your due date.

If your periods are a predictable 28-day cycle, your calculated due date should be fairly accurate. But if your cycles are longer or shorter than 28 days, your actual due date might fall before or after the projected date.

As your pregnancy progresses, your health-care provider will double-check the many factors that indicate the age of a fetus. She'll note the growing size of the uterus. She'll mark the time you first feel movement and when the heartbeat is detected. If these dates don't match up with your projected due date, your doctor might suggest that you take an ultrasound test. The ultrasound will show the size of the fetus and give a very good indication of its age.

|

excerpted from:

Excerpted from The Complete Idiot's Guide to Pregnancy and Childbirth © 2004 by Michele Isaac Gliksman, M.D. and Theresa Foy DiGeronimo. All rights reserved including the right of reproduction in whole or in part in any form. Used by arrangement with Alpha Books, a member of Penguin Group (USA) Inc.

To order this book visit Amazon's website or call 1-800-253-6476.


Pregnancy Day by Day

Tell us your due date to receive our daily newsletter and find out what is happening in this day of your pregnancy!

Already a member? Log-in here

Name of the Day

stay connected

highlights

6 Non-Dairy Milk Alternatives
If your child has a milk allergy, it can be tough to find an alternative that meets his dietary needs. Read on to find out which non-dairy milk options are available, and how each one stacks up nutrition- and taste-wise.

Kindergarten Readiness App Wins Gold
Our Kindergarten Readiness app won the Gold Award of Excellence in the educational category at the 2014 Communicator Awards. This valuable checklist comes with games and activities to help your child practice the essential skills she needs for kindergarten. Download the Kindergarten Readiness app today!

15 Not-So-Scary Halloween Movies for Kids
Halloween doesn’t always have to be a fright. Take the scare-factor down a notch by watching one of these not-too-scary Halloween movies for kids.

Find Today's Newest & Best Children's Books!
Looking for newly released books for your child? Try our new Book Finder tool to search for new books by age, type, and theme, and create reading lists for kids!

© 2000-2014 Pearson Education, Inc. All Rights Reserved.