My first was stubbornly posterior despite my best efforts. He was also born posterior (with his hand up beside his head! ouch!). My second was also posterior during pregnancy and again I tried my best to flip him. My brilliant midwife gave me this fantastic tip: once labour starts with regular contractions, get on all fours, butt in the air, arms and head down on a pillow and stay there for one hour. This seemed to spin baby into an optimal position and he was a quick and easy birth (total 3 hour labour, born 20 minutes after arriving at hospital). I wish I had known this for no 1 as I spent the first 1.5 hours of his birth walking, which just jiggled him down into my pelvis in a posterior position and he was a 10 hour labour.