My second was my quickest by a loooooooong way (active labour was 15 minutes!) so I was scared to death what my third would be. My little miss gave me a couple of false alarms where I went to hospital with very strong, regular contractions only to have them fizzle to nothing. In the end my hind waters broke just after 8am and I didn't get any contractions at all until about 3pm, and then no "real" contractions until more like 5.30 pm. Miss 3 was posterior and stayed that way so it was pretty ouchy but I spent a lot of time in the shower and just rocking through contractions. My second and third were both drug free and while DD3 was posterior, the labour was still far less intensel, albeit longer, than DD2's incredibly quick arrival.
The biggest thing for me was the post labour pains after DD3. They get longer and more intense apparently with each birth and that was certainly the case for me.

