It's very common for babies to be in a posterior position, so midwives see it a lot. Some will advise an epidural to cope with the extra discomfort of labouring with your baby in this position but most that I have worked with would start with positioning techniques for you to try in pregnancy and also for labour to get the baby turned. Some things I would ask you to try would be sitting on an exercise ball, or straddling a kitchen chair instead of relaxing on the sofa. Also relaxing on your hands and knees over a beanbag can help and if you are keen, scrubbing the floors on your hands and knees is a great trick (especially if you are nesting like crazy). for labour I would encourage someone with an OP baby to sit on a ball or lean over a beanbag and to avoid laying on their back.

Babies can be born in an OP position although it is not very common. They need a little bit more space to get out that way but some women have a pelvis that is the ideal shape for baby to get out posterior and that's just how your baby will want to come.

If you would like some extra support then you can arrange for a student midwife to follow you through and ask him or her to research ideal positions for labour and help you with this. Just contact your local university or hospital and ask them to arrange someone, most student midwives are crying out for the experience. Hope that helps