Posterior Position – Turning Baby Prenatally

Fetal position at the onset of labour is one of the greatest determining factors of how the birth process will proceed.  During labour the fetus makes certain movements to descend through the pelvis.  The optimal fetal position is pictured below.  A good way to remember the best position is to think about giving your baby a back rub every time you rub your belly.

A spot near the back of the fetal head is used to determine fetal position.  The terms “posterior” or “sunny-side up” describe a baby who faces out, or is spine-to-spine with mother.   “OP” is the medical jargon.  The presenting part of the head is bigger in this position and the baby doesn’t flex and rotate as well as an anterior baby.

Problems Related to Posterior Position

  • More difficult for baby to drop into and through the pelvis
  • Pregnancy may last longer
  • Membranes are more likely to rupture before the onset of labour
  • Labour may progress slowly or not at all
  • Back-pain during labour that doesn’t disappear between contractions
  • Increased risk of tearing
  • Increased risk of instrumental or surgical birth
  • Increased stress on baby’s head and nervous system

However some women birth a posterior baby just fine.  Those include but are not limited to, women who’ve given birth without difficulty before, those with an average or smaller baby, a labouring woman who’s able to move about freely and allow her baby to rotate into an anterior position.

Fetus in WombBaby in optimal position:  head down and flexed, back out.

Signs of a Posterior Baby

  • Feeling kicks or flutters at your front
  • Frequent urination (more frequent than with anterior pregnancy)
  • Belly appears flat or lumpy
  • Your midwife or doctor can tell by palpating your abdomen, as is done at every prenatal visit
  • Fetal heart-tones may be difficult to hear
  • Head is not engaged or doesn’t drop into pelvis
  • Can be confirmed with ultrasound
  • During labour she can also tell during an internal examination

Factors Contributing to Posterior Position
Posterior-babies can occur with no risk factors, but the following increase the chances:

  • North American lifestyle – reclining in upholstered furniture, sedentary lifestyle, sitting in cars (it’s interesting to note this position is rare in cultures where women walk a lot or work bent-over, and lack Lazy-Boy style chairs and couches)
  • Sitting with legs crossed
  • Postural or anatomical issues
  • Issue of uterine / abdominal muscles (e.g. tight psoas)
  • First pregnancy
  • Epidural use early in labour (hinders rotation and descent of baby) is correlated with more than 3x the rate of posterior position at birth (Tully, 2008)
  • Labouring in bed or without adequate movement
  • Baby who was breech and turned to vertex
  • Mother with history of breech or posterior baby
  • Short or tight cord around baby
  • Emotional issues – fear of birth or parenting, not paying attention to pregnancy, family history of breech, relationship issues, financial concerns, stress (Frye, 1998)

Tricks for Turning a Posterior Baby to an Anterior Position
Sometimes there’s a reason (that we don’t know about) for baby to be posterior and nothing will turn her or him.  But in many cases a baby can be turned.  Please ask for details or referrals.

  • Visualization and “talking” to your baby. Focus on letting the baby know it’s easier to get out when facing the other way.  This works especially well if combined with changing your emotional environment e.g. dealing with fears, prepping for birth.
  • Look at a picture of baby in proper position (e.g. Fig. 1), or have it drawn on your belly!
  • Webster Technique with a chiropractor certified in its use. Pistolese (2002) cites an 82% rate of success in relieving the musculoskeletal causes of intrauterine constraint.  It’s beneficial to perform the Webster Technique starting at 35-36 weeks.
  • Sit with pelvis tilted forward – knees below pelvis with straight back. Instead of upholstered furniture, use a birth ball, the floor, a kneeling chair or a regular hard chair or stool
  • Hands and knees – read, crawl around, or child’s pose modified for pregnant belly
  • Pelvic rocking while on all 4’s – gentle cats and dogs yoga postures – several times daily
  • Swimming or floating – anything with belly down like a hammock for baby to drop into
  • Movement and exercise
  • Sleep on left side with a body pillow – left leg straight, right leg bent on pillow
  • Keep belly warm (babies may turn back to keep warm against mother’s back)
  • Homeopathic Pulsatilla 200CH, 1 dose every 3 days.
  • Acupuncture or moxibustion – see a Traditional Doctor of Chinese Medicine or an acupuncturist who specializes in women’s and pregnancy care.
  • Deal with fears around childbirth and parenting
  • Postural management – check out spinningbabies.com for some excellent postures and exercises that encourage babies to assume optimal positions for birth.

 

References

Frye, A. (1998). Holistic Midwifery, Vol 1, Care During Pregnancy. Portland, OR: Labrys Press.

Ohm, J. (2006). About the Webster Technique. Retrieved from icpa (International Chiroractic Pediatric Association): http://icpa4kids.com/about/webster_technique.htm

Pistolese, R. (2002). The Webster Technique: A chiropractic technique with obstetril implications. Journal of Manipulative and Physiological Therapeutics , 25 (6), E1-E9.

Tayler, R. (2000). Homeopathy for Pregnancy and Childbirth. Ottawa: Ottawa School of Homeopathy.

The Midwifery Group. (2008). Posterior Babies. Retrieved from The Midwifery Group: http://www.midwiferygroup.ca/downloads/position/Posterior%20Babies.pdf

Tully, G. (2008). Occiput Posterior – OP. Retrieved from Spinning Babies: http://www.spinningbabies.com/baby-positions/posterior

Breech Baby – What You Can Do Prenatally

“Breech” is a term describing your baby as head-up rather than the optimal head-down position.  Breech position is not uncommon in the middle of pregnancy and most babies turn head down toward the end.  Some turn during labour.  A baby coming bottom first can have more difficulty being born and while a caesarean birth may be suggested, there are many doctors willing to catch breech babies.  For now let’s focus on turning the baby.   The best time to turn the baby is around 35 weeks.

Baby Movements / Fetal Kick-Counts

Awareness of your baby’s movement is an important and non-invasive assessment of fetal well-being.  Basically, activity is reassuring and decrease or cessation is worrisome.  “Kick count” is the counting and tracking of fetal movement – kicks, flutters, swishes, jabs or rolls.  Mothers learn normal patterns for their baby such as sleep cycles, times of activity and triggers.  It’s also a way to bond and connect.

If you’ve been busy or are unsure about movement relax and have a meal, a small glass of juice or some fruit.  Palpate your baby to induce movement.  Pay attention to the movements.  Babies sleep.  If your blood sugar is low then so is your baby’s.  You should feel at least 10 movements over 2 hours (it usually takes much less time), and at least one movement in the first hour.

Keeping a journal of kick counts beginning at 28 weeks provides valuable information.

Instructions

  • Be properly hydrated and fed.
  • Ideally start the kick count at about the same time daily; think of it as a baby-date.
  • Rest when you do the kick counts, by sitting or lying on your left side.
  • Note the date, start time and the time at which the 10th movement takes place.
  • Calculate the total time for 10 movements.
  • Keep notes in the same place to see patterns emerge. Any method works.  Below is an example of a chart and one of a log.

Contact your midwife, doctor, or go to the birth unit at your local hospital immediately if:

  • You have followed the recommendations above and have not felt 10 kicks in 2 hours.
  • There’s a significant change in the pattern over the 3 to 4 days.
  • Your baby has a significant or sudden change in movements.
  • You have concerns.

Example of a Kick Counts Log
Note the date/week of gestation, and start time.  Count or jot down a √ or x for 10 movements.  Note the finish time, and total time.   Keep an eye on patters with the total time.

Week #32
Mon 9:00 XXXXXXXXXX    9:32         Total: 32 min
Tues 12:00 XXXXXXXXXX    12:45     Total: 45 min
Wed 9:00 XXXXXXXXXX    9:55      Total: 55 min
Thurs 9:00 XXXXXXXXXX    9:45      Total: 45 min
Fri 9:30 XXXXXXXXXX    10:05      Total: 35 min
Sat 9:15 XXXXXXXXXX    10:05      Total: 50 min
Sun 10:00 XXXXXXXXXX    14:15      Total: 4 hr, 15 min

Note the significant change in total time.  In this case you would seek medical attention on Sunday.

Kick Count- Blank Tracking Sheet (pdf)

Kick Count Chart – example (pdf)