How to Calculate a Person's Date of Birth
One of the first things an expectant mother wants to know is her due date. Calculating the baby's birthday helps parents-to-be plan more efficiently for the big day. It also helps doctors chart the baby's and mother's growth and development during the pregnancy. You can calculate a birth date using some simple math, but remember that this is merely an estimate. Babies can be born two weeks before or after the due date, and the pregnancy is still considered to be normal term.
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Instructions
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Calculation No. 1
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1
Determine the first day of your last period.
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2
Add 14 days to establish your estimated time of ovulation. This is when you most likely conceived.
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3
Add 280 days from your ovulation day to calculate the baby's due date. Having a calendar on hand makes this step easier.
Calculation No. 2
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4
Determine the first day of your last period.
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5
Count backward three months. For instance, if the first day of your last period was Nov. 14, you would count backward to August 14.
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6
Add seven days to this date. In this illustration, your due date is Aug. 21.
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Tips & Warnings
Make sure you have regular prenatal checkups. Your doctor may adjust the calculation of your baby's birthdate depending on your measurements and the baby's measurements during ultrasounds.
