LOA stands for Left Occiput Anterior, and it describes a baby positioned head-down with the back of its skull (the occiput) angled toward the left front of your pelvis. In this position, your baby faces your spine, its chin is tucked to its chest, and its back curves along the left side of your belly. LOA is widely considered one of the most favorable positions for vaginal birth.
What LOA Looks Like in the Womb
To picture LOA, imagine your baby upside-down with its face turned toward your back. The baby’s spine runs along the left side of your uterus, and its arms and legs are drawn inward toward its chest on the right side. The “left” in LOA refers to your left, not the baby’s, and “anterior” means the back of the baby’s head points toward the front of your body rather than toward your spine.
This is one variation of what’s called a cephalic anterior or occiput anterior position. The other common variation is ROA (Right Occiput Anterior), where everything is mirrored to the right side. Both are considered normal, head-down, face-back orientations ideal for delivery.
Why LOA Is Considered Ideal for Birth
When a baby is in any occiput anterior position, the narrowest part of its head leads the way through the birth canal. The tucked chin allows the skull to navigate the pelvis more efficiently, and the baby can rotate through the pelvic bones with less resistance. This generally translates to smoother labor progress and lower odds of needing intervention compared to posterior positions, where the baby faces your belly instead of your back.
That said, the idea that LOA is specifically superior to other anterior positions has been challenged. A prospective study published in BJOG found no evidence that starting labor in LOA versus other head-down positions made spontaneous vaginal delivery more likely. The researchers concluded that the longstanding belief in LOA as “the” optimal starting position may be overstated, and that antenatal practices encouraging LOA through maternal posturing are likely unnecessary. In practical terms, any anterior, head-down position is a good position for birth.
How Your Provider Identifies LOA
Your midwife or doctor can often determine your baby’s position during a routine prenatal visit using a hands-on technique called Leopold maneuvers. During these abdominal checks, the provider feels for specific landmarks through your belly. A firm, smooth structure running along one side of your uterus indicates the baby’s spine, while small, knobby, mobile bumps on the opposite side are limbs.
For LOA specifically, the provider would feel the spine along your left side and the baby’s limbs (kicks and elbows) more toward your right. By pressing gently downward near the pubic bone, they can also locate the baby’s forehead and confirm which direction the head is facing. If there’s any uncertainty, an ultrasound can verify the position.
What You May Feel With a Baby in LOA
Because your baby’s back is along your left side in LOA, you’ll typically feel the strongest kicks and jabs on the right side of your belly. That’s where the arms and legs are. The left side of your abdomen may feel firmer and smoother to the touch since the baby’s back is pressed there. You might also notice a hard, round bump near your upper abdomen on the left, which is the baby’s bottom.
Many people with a baby in an anterior position report less back pain during labor compared to those whose baby is posterior. When the baby faces your spine, its skull doesn’t press against your lower back the way it does in a face-up position, which is a common source of intense “back labor.”
When Babies Settle Into Position
Babies move freely throughout most of pregnancy and don’t typically settle into a fixed position until the third trimester. For first pregnancies, many babies drop into the pelvis and take on their birth position between weeks 34 and 36. In subsequent pregnancies, this can happen later, sometimes not until labor begins.
A baby in LOA at 30 weeks may shift to a completely different position by 36 weeks, and even babies who are posterior or breech in the late third trimester sometimes rotate on their own before or during labor. Position checks before about 36 weeks give a snapshot, not a prediction.
Encouraging an Anterior Position
While the research doesn’t support the idea that LOA is meaningfully better than other anterior positions, many pregnant people still want to encourage their baby to face backward rather than stay posterior. A few simple habits may help, though none are guaranteed.
- Forward-leaning postures: Sitting upright or leaning slightly forward, rather than reclining deeply on a couch, allows gravity to pull the heaviest part of the baby (its back) toward the front of your belly.
- Hands-and-knees position: Spending time on all fours can give the baby room to rotate away from a posterior position.
- Upright movement: Standing and walking with gentle side-to-side swaying encourages both rotation and descent into the pelvis.
- Lunges: Side lunges during late pregnancy or early labor can open one side of the pelvis and help a baby shift into a better alignment.
These techniques are low-risk and can feel good during late pregnancy regardless of your baby’s position. If your provider tells you the baby is already in LOA or any other anterior position, there’s no need to do anything special to maintain it. Babies in a favorable position tend to stay there once they’ve engaged in the pelvis.