A frank breech baby is positioned bottom-down in the uterus with both hips flexed and both legs extended straight up, so the feet are near the face. Think of a pike position in diving. It’s the most common type of breech presentation, and while it does change the conversation around delivery, it’s also the breech position with the most options.
How Frank Breech Differs From Other Breech Types
All breech presentations mean the baby is bottom-first rather than head-first, but the position of the legs varies. In a frank breech, the baby’s legs are straight up like a V, with the buttocks as the lowest part of the body. In a complete breech, the baby sits cross-legged with both hips and knees bent, like a tuck position. An incomplete (or footling) breech has one or both feet dangling below the buttocks, with the legs partially extended downward.
These distinctions matter because they affect both delivery safety and the likelihood of successfully turning the baby. Frank breech is generally considered the most favorable breech position for both turning attempts and, when applicable, vaginal birth.
How It’s Detected
Most providers check fetal position during routine prenatal visits in the third trimester by feeling the outside of your abdomen. A hard, round shape (the head) felt near the top of the uterus instead of down in the pelvis is the first clue. With a frank breech specifically, you might feel strong kicks up near your ribs or notice a firm lump (the head) lodged under your ribcage.
Ultrasound confirms the diagnosis and distinguishes frank breech from other breech types. Your provider will look at exactly how the hips and knees are positioned to classify the presentation. This imaging also checks for factors that could influence management, like the amount of amniotic fluid, the position of the placenta, and whether the baby’s head is flexed (chin tucked) rather than extended.
Turning the Baby: External Cephalic Version
Before discussing delivery options, most providers will offer a procedure called external cephalic version, or ECV, typically around 36 to 37 weeks. During an ECV, a provider uses their hands on your abdomen to manually guide the baby into a head-down position. It’s done in a hospital setting with monitoring, and while it can be uncomfortable, it doesn’t require surgery.
Frank breech babies respond to this procedure better than other breech types. One study found a 78% success rate for turning frank breech babies, compared to roughly 40% for non-frank breech presentations. Several factors influence whether the procedure works. A relaxed uterus and a placenta positioned on the back wall of the uterus are both associated with higher success. A tense uterus significantly lowers the odds. Pain during the procedure also correlates with lower success rates, which is why some providers offer medication to relax the uterus beforehand.
If the baby turns successfully, labor and delivery proceed as normal. If the baby flips back to breech afterward (which happens in a small percentage of cases), the options below come into play.
Delivery Options
When a baby stays in frank breech position at term, the two main paths are a planned cesarean section or, in select cases, a planned vaginal breech birth.
Cesarean delivery is the most common approach in the United States and many other countries. It eliminates the risks specific to delivering the head last, which is the central concern with any breech vaginal birth. For most people with a breech baby, this is the recommended route.
Vaginal delivery is not off the table, though. The American College of Obstetricians and Gynecologists states that planned vaginal delivery of a breech baby may be reasonable when strict criteria are met under a hospital-specific protocol. Those criteria typically include: pregnancy beyond 37 weeks, frank or complete breech position, an estimated baby weight between about 5.5 and 8.8 pounds, no fetal abnormalities on ultrasound, adequate pelvis size, sufficient amniotic fluid, and a baby whose head is flexed (chin tucked). Labor induction and augmentation are generally not used in these protocols, and labor must progress normally on its own.
The challenge is finding a hospital and provider experienced in vaginal breech delivery. It requires specific training that has become less common over the past two decades, so this option isn’t available everywhere. If vaginal breech birth is something you want to explore, the conversation needs to start well before your due date.
Hip Screening After Birth
One thing to know about frank breech babies, regardless of how they’re delivered, is a higher risk of developmental dysplasia of the hip (DDH). This is a condition where the hip joint doesn’t form properly, ranging from mild looseness to a fully dislocated hip.
Babies born in breech position have roughly twice the risk of DDH compared to head-down babies, and the risk is highest in the frank breech position specifically. The likely reason is mechanical: the baby’s legs are extended straight up with the hamstring muscles pulling across flexed hips for weeks, which can affect how the hip socket develops. Other risk factors that compound this include a family history of DDH and swaddling with the legs held straight (which is why hip-healthy swaddling keeps the legs free to bend).
Because of this elevated risk, pediatricians screen frank breech babies for hip stability at birth and during early well-child visits by checking how the hips move. Many providers also recommend an ultrasound of the hips at around 6 weeks of age, even if the physical exam seems normal. When DDH is caught early, treatment with a soft brace is highly effective, and outcomes are excellent. Catching it late is more complicated, which is why the screening matters.
Why Some Babies End Up in Frank Breech
Before about 32 weeks, babies frequently change position, and breech is perfectly normal. Most flip to head-down on their own by 36 to 37 weeks. About 3 to 4% of babies remain breech at term.
Sometimes there’s an identifiable reason: a uterine shape abnormality, fibroids that limit space, too much or too little amniotic fluid, a placenta that sits low, or a short umbilical cord. First pregnancies carry a slightly higher chance of breech, possibly because the uterine muscles are tighter and give the baby less room to turn. In many cases, though, there’s no clear explanation. The baby simply settled into that position and stayed.