I would be very interested to learn these stats too so will be watching this thread closely. To add to Tenar's questions, I would also like to know: Do some women have naturally shorter pregnancies than others, i.e. is the standard 40 week pregnancy an average and do some women naturally give birth at say 38 weeks, while others naturally wait til 41 weeks, etc? (hope that makes sense.)

My DD was born 4 1/2 weeks early, completely healthy, able to breathe, feed, etc, no need for NICU. Many babies in my family have been born early (e.g. I was about 8 days early, my brother was 10 days early, neither had any complications), so I am wondering if it is normal for some babies to come earlier than others.