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Length of human pregnancy varies as much as 5 weeks
Length of human pregnancy varies as much as 5 weeks (August 7, 2013 - Insidermedicine) From North Carolina - The length of pregnancies in humans can vary as much as 5 weeks, according to a report published in Human Reproduction. Researchers reviewed data from an earlier study, in which 130 singleton pregnancies were followed from conception to birth. All of the women were healthy with no fertility problems and were at reduced risk of obesity and smoking. Researchers calculated the date of conception through urine samples. Results showed that the average time from ovulation to birth was 268 days--or 38 weeks and two days--while pregnancies are calculated to last 280 days. After excluding 6 preterm births, researchers found that the length of pregnancies still varied by as many as 37 days.
 
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