# Calculation Of Estimated Birth Days.?

I want to ask, if the baby was born on March 23, 2019, what month is the beginning of pregnancy? Thank you

Good morning, thanks for asking at HealthReplies.com. In medicine, known as HPL or Estimated Birth Day which is determined usually by the formula Naegele. To be able to find out the estimated birth of a baby using this formula, you need the HPHT number or First Day of Last Menstruation (also known as HPMT or First Day of Last Menstruation) before you know that you are pregnant. Then from that date +7 for the day, -3 for the month and +1 for the year.

For example, your HPMT on January 21, 2018, the calculation is 21 + 7 = 28, January minus 3 means it falls in October, and because October means it is in 2017, then 2017 + 1 = 2018 (fixed). The conclusion is that the HPL is October 28, 2018.

Regarding your question, if using this formula means that it only needs to be reversed, and the results if the baby is born on March 23, 2019, then the possibility of early pregnancy is on June 16, 2018.

But what you need to know is that this formula applies at 40 weeks' gestation, because the average baby is born at that age. In fact, babies may not be born exactly 40 weeks. It could be 37 weeks, 39, 36, or even 33 weeks for the premature, or it could be 42 weeks for post-date babies. So as the name suggests, HPL or Birth Estimation Day is only an estimate, and the reality can be different, depending on various factors that cannot be fully controlled. So, hopefully answering your question.

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