Babes are born sunny side up as well, not always in the right position......Even breech babies are born vaginally these days
and 1 in 10 are posterior in labour - Most back-to-back babies are born vaginally, but this position can make labour more difficult for you, particularly if your baby's chin is pushed up rather than tucked in. As a result:
you may have backache as your baby's skull is pushing against your spine
your waters may break in early labour
your labour may be long and slow
you may feel like pushing before your cervix is fully dilated
When your baby gets to the bottom of your pelvis, he'll need to turn through almost 180 degrees to get into the best position to be born.
This can take quite a while, or your baby may decide he's not going to turn at all! In this case, he will be born with his face looking up at you as he emerges. He might need forceps or ventouse to help him out.
Try the following:
Check that your favourite armchair doesn't make your bottom go down and your knees come up. If it does, try turning the chair round, kneel on the seat pad and lean forwards over the back of the chair.
Scrub the floor! Our grannies used to say that washing the kitchen floor was a good way of preparing for labour. They were right - when you're on all fours, the back of your baby's head swings to the front of your belly.
Take regular breaks and move around if your job involves a lot of sitting.
Sit on a cushion in your car to lift up your bottom.
Watch TV leaning forward over a birth ball.
It's common for babies to change position during labour and most babies get themselves into an anterior position by the pushing stage, no matter what position they were in at the start of labour.
You may find that the best posture to labour in is on all fours. In this position, your baby drops away from your spine, helping to relieve backache and hopefully helping him to turn, too.
When you're in actual labour, try to:
Stay upright for as long as possible.
Lean forwards during your contractions use a birth ball, bean bag, your partner or the bed to lean on.
Ask your birth partner to massage your back.
Rock your pelvis during contractions to help your baby turn as he passes through the pelvis
Don't stay sitting in a chair or on a bed in a leaning-back position for too long.
Try not to have an epidural if you can, as epidurals may increase the chance of your baby being in a posterior position at birth. Epidurals also make having an assisted birth more likely.
If you get exhausted during labour, lie on your left side, as your pelvis can still expand to give your baby space to turn while you are resting.
(stolen from https://www.babycentre.co.uk/pregnancy/labourandbirth/planningyourbabysbirth/babyinpositionforbirth/)