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Fetal development: The 3rd trimester

Week 40: Your due date arrives

Forty weeks into your pregnancy, or 38 weeks after conception, your baby might have a crown-to-rump length of around 14 inches (360 millimeters) and weigh 7 1/2 pounds (3,400 grams). Remember, however, that healthy babies come in different sizes.

Don't be alarmed if your due date comes and goes with no signs of labor starting. Your due date is simply a calculated estimate of when your pregnancy will be 40 weeks. It does not estimate when your baby will arrive. It's normal to give birth before or after your due date.