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I think the risk of C/S is because when they are coming out posterior, they can't tuck their heads in so that the smallest part is coming out first. So they can get a bit stuck. Maybe Kelly can come in here & explain it better.
My son was born just last week - he was posterior as well and unfortunately I did end up with a c/s. However he also had his head flexed back instead of chin tucked forward - this was the main reason for the c/s. If he'd just been posterior he probably would have righted himself during labour and even if he didn't he could have still been born that way. Many ladies do it, it's just a bit harder work.