Calendar the expected delivery date (da)

The exact date of birth is almost impossible to determine, because the timing of conception is often unknown, and the duration of pregnancy can be different. Most likely the pregnancy between 8 - 14 days of the menstrual cycle.

With this calendar you can theoretically calculate the date of delivery. Just find the first day of the last month in the row of blue color and date under found will correspond to the intended day of delivery.
For example, the circled date: if the first day of the last month was June 13, you give birth to a baby approximately 20 March, if January 11 - the birth can take place on October 18.

Source:

here

women's web magazine