How to Determine a Birth Date

Once it has been determined that you are pregnant, it is important to determine the age of gestation in order to monitor adequate fetal growth and development and to figure out the estimates date of delivery (EDD). The date of delivery is estimated using the first day of the last menstrual period (LMP). The EDD is then confirmed with ultrasonographic measures.

Instructions

Estimated Date of Delivery

• 1

  Determine the first day of your LMP.

• 2

  Subtract 3 months from the LMP.

• 3

  Add 7 days to the result of step 2. This is the EDD.

Example

• 4

  My LMP was August 23rd 2010.

• 5

  Subtracting 3 months from LMP gives May 23rd.

• 6

  Adding 7 days to step 2 gives May 30th 2011 as the EDD.