Your due date is estimated by adding 40 weeks (280 days) to the approximate first day of your last menstrual period. Only 5% of women deliver their babies on their projected due date, so this date should be used as an estimate - it is not an exact calculation.
Here are some tools you'll need as you go through pregnancy. Use the baby name finder to help you choose a great name. Want to know when to expect your newborn baby? Use the due date calendar to determine your new child's birthday. Read articles on your baby's development in the womb, birth methods, exercise during pregnancy and proper nutrition.