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  Calculate Your Baby's Date of Birth:


Enter the date of the first day of your last menstrual period.

This must be in the form YYYY/MM/DD. For example, if the first day of your last menstrual period was March 11, 1999, you would enter that date in the space below as:  2007/03/11

Press the 'click me' button to calculate the estimated birth date based on the date entered in .

The white space below will contain the estimated birth date of your baby.

The date will always be in the form year/month/day, though the number of digits for each may vary. See "A Word from our Webmaster" below.


A Word From Our Web Master

Depending on the browser you are using (Netscape or Internet Explorer, etc) and the version of that browser, the birth date displayed in Step 3 above may contain a two digit ( YY ) or four digit ( YYYY ) year representation, and/or a one or two digit (M,MM/D,DD) month or year representation. This is due to the way the different browsers interpret Java Script date formats. If a two digit year appears, assume this refers to a 19YY year. We have done our best to represent birth years greater than 1999 correctly, but cannot guarantee that we have accounted for all of the various browser variations.

A Word From Our Lawyers

The above calculation is based on a straight formula of adding 280 calendar days to the date entered in Step 1. This is a generally accepted estimate of birth date (due date) but it is only an estimate, and should not be taken as a guarantee of your child's date of birth. Because most births occur within 10-14 days on either side of this date, this calculation should be taken as an estimation/reference only. Your   doctor or obstetrician can confirm your expected due date with you.