I think its different for everybody. I know with my first pregnancy (I had twins) so they were early and with my second I was induced. I was in labor for 8 hour with my first pregnancy and 4 hours with my second pregnancy.
at 1:51 PM on Oct. 1, 2008
with my first i was 36.5 weeks and labor lasted 12 hours i am pregnant with my second one right now and i have made it to 38 weeks and two days i going to be induced tuesday if i do not have her this weekend. so i would say that babies come whenever they want to it doesnt matter if they are your first or your 12th