What is EDD and How It is calculated?

Estimated Date Of Delivery (EDD) Pregnancy Due Date Calculation is very common and one should me know about this phenomenon of LIFE .

In Health support and Guided Video , Dr. Manoranjan Mohapatra , Answers the Basic question on What is EDD and How It is calculated? He goes on describing EDD with numerous Calculation Methods and some of the Problems Pregnant Women Faces during these Gestation Period.

A Must Watch Video For all 

What is gestation in English?

As per the Definition by Merriam-Webster it States 
"English Language Learners Definition of gestation. : the time when a person or animal is developing inside its mother before it is born also : the process of development that happens during this time. : the process by which something (such as an idea) forms and develops." -- Gestation | Definition of Gestation by Merriam-Webster @www.merriam-webster.com/dictionary/gestation
Gestation, is the time of Period , during which one or more offspring develops inside a woman. Childbirth typically occurs around 40 weeks from the start of the last menstrual period (LMP).

Simply Speaking the Child birth Occurs just over 9 months  as per the LMP 

Gestation Period or Pregnancy is classified into three Stages or called as trimesters divided evenly into 3 months each
Fertilization leads to An embryo is the developing offspring during the first eight weeks
<a title="Caitlinamy / CC BY-SA (https://creativecommons.org/licenses/by-sa/4.0)" href="https://commons.wikimedia.org/wiki/File:Pregnancy_trimesters.jpg"><img width="128" alt="Pregnancy trimesters" src="https://upload.wikimedia.org/wikipedia/commons/6/61/Pregnancy_trimesters.jpg"></a>

  • Months 1 - 3 Are The First Trimester (LMPUp To 12 Weeks)
  • Months 4 - 6 Are The Second Trimester, And  (13 Weeks To The 27 Weeks)
  • Months 7 - 9 Are The Third Trimester. (28 Weeks To 40 Weeks )

EDD Calculation Pregnancy

Lunar Months
Prenatal development is often measured in lunar months. Each lunar month consists of 28 days, organized into four weeks of seven days each. That means a pregnancy is 10 lunar months long!

Naegele's rule
Naegele's rule is a standard way of calculating the due date for a pregnancy when assuming a gestational age of 280 days at childbirth. The rule estimates the expected date of delivery (EDD) by adding a year, subtracting three months, and adding seven days to the origin of gestational age. The result is approximately 280 days (40 weeks) from the start of the last menstrual period. Another method is by adding 9 months and 7 days to the first day of the last menstrual period.

Naegele's rule is named after Franz Karl Naegele, the German obstetrician who devised the rule. Naegele was born July 12, 1778, in Düsseldorf, Germany. In 1806, Naegele became ordinary professor and director of the lying-in hospital in Heidelberg. His Lehrbuch der Geburtshilfe, published in 1830 for midwives, enjoyed a successful 14 editions.

Here's the formula to calculate your Estimated Due Date using Naegele's rule :
Date of Last Menstrual Period + 7 Days + 9 Calendar Months = Date of Estimated Date of Delivery

In the Video Dr. Manoranjan Mohapatra , describes the other options, to understand EDD , when the person forget LMP Date. In that scenario,
Gynaecologist & Obstetrician Doctors takes help of Ultrasonography. The machine gives the composite calculation using the bipartite diameter head circumference, abdominal circumference, and female length these

276 days for both ultrasound-estimated and LMP-estimated gestational age in a US study of 1867 singleton live births