It must be taken into account that, although the exact day of fertilization was known with absolute certainty, the calculation of the day of delivery is a mere assumption, because there are numerous factors that influence whether the delivery is early or delayed, and it is considered normal to occur between three weeks before and two after the probable date.
Only 50-60% of deliveries occur more or less on the date that was estimated likely, and 10% of women give birth before the 37th week.
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Aug 25 20219 mins