Estimated Due Date

The approximate date for when the baby is due to be born. The due date is calculated based on the last menstrual period. To calculate the estimated due date based on the last menstrual period, take your last menstrual period and add nine months plus one week. To calculate the estimated due date based on ovulation, add nine months and subtract one..
Found on http://www.pregnology.com/AZ/E/4
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