I have heard what to do with a posterior baby in labor. This is from a childbirth educator who read a booklet on it written by a woman who had 4 posterior babies. I have not tried this myself, but apparently, it works really well. What you do is, every time you have a contraction, you clasp your hands together below your belly and pull them upwards. You may want oil or lotion on your belly. This directs the energy of the contraction upwards so that the baby goes downwards. According to this booklet, this woman's babies came very quickly because of what she was doing. HTH.