This question often occure in my mind when I got my pregnancy. Because this will affect to my activities schedule and made me arranged when would I went for shopping baby clothes, when would to take leave from my work.
It is important to calculate when will your baby delivered. Why it is important? Because approximate date of birth will ensure you and obstetrician than your pregnancy development is normal where fetal development is normal accordance with the age of your pregnancy, and surely will make you can make good planning and preparation of birth.
Estimate date of birth can be calculated from the first day of las menstrual, based in the calculation of the pregnancy is over 280 days or 40 weeks or 9 months and 7 days.
There is a formula used to determine the approximate birth, his name Neegle formula, but formula is valid only for women 28-day menstrual cycle. Approximate / estimated deliveries made under the age of 40 weeks gestation because of research found that 90% of women experience labor at 40 weeks gestation. The formula is simple, which fall on the first day of last period plus 7, month and year minus 3 plus 1. So if the first day of mother's last menstrual period is 28/05/2010, then the estimate of labor (28 +7) / (5-3) / (2010 +1) -> 35/2/2011; since February 2009 does not have a date 35, then the correction to be relegated to the next month is March, so the estimated birth mother is (35-28) march of 7 March 2009. Month of gestation is enough time in the range of 38-41 weeks, so the approximate birth mothers can go back 2 weeks or 1 week from that date.
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