Many amazing events can happen during childbirth, but one of the most fascinating is an en caul birth. In this rare type of delivery, a baby is born completely inside the amniotic sac, often called the “bag of water.” This phenomenon has long captured the attention of parents and medical professionals alike.¹

En caul births are uncommon and surrounded by cultural beliefs and myths, with some people viewing them as magical or symbolic. While the experience is visually striking, there are relatively few proven benefits or risks. Some parents hope for this type of birth because it feels natural and unique, but it is not something that can be reliably planned.⁴

What Does En Caul Mean?

When the amniotic sac doesn’t break before your baby is born, you have an en caul birth. A baby born in the bag may also be referred to as a “mermaid birth” or a “veiled birth.” It’s neither a good nor a bad thing. It’s simply unusual.⁵

Typically, the amniotic sac ruptures before contractions begin or during labor and delivery. The fluid releases and continues to leak until your baby is born. A doctor or midwife may break the bag of water to induce or stimulate labor. If the bag is still intact when you start pushing, it will likely rupture due to the increased pressure created. But if it doesn’t, you may have an en caul birth.⁶

“En caul” is different than “caul.” Caul means that a piece of the membrane is over your baby’s face, head, or chest when she is born, but the bag is not intact. The portion of the membrane may look like a veil or a helmet.⁷

Related: How Do You Know if Your Water Broke?

What Does an En Caul Birth Look Like?

During an en caul birth, your baby is born in what resembles a large, squishy water balloon filled with fluid. Often, a portion of the bag delivers first, filled with liquid as it pushes out of your vagina. The rest of the sac with your baby’s head and body follows.⁶

The bag of water has two fused membranes. You can see through the membranes. Your baby will be curled up in the bag and get oxygen through the umbilical cord. You can see how your baby was nestled in your uterus before birth.⁶

What Happens After an En Caul Birth?

Once your baby delivers en caul, the doctor, midwife, and nurses all ooh and ahh over the wonder and point it out to you. Then, your provider gently snips the bag with scissors or another instrument or pokes a hole with a finger. The water pours out. The membranes then cling to your baby. Your doctor or midwife carefully pulls them away from your baby’s face so she can breathe. Finally, you get to hold your baby for the first time. Cutting the cord and how your placenta delivers will be like any other birth.⁶

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How Common is an En Caul Birth?

Very little information is available on the frequency of en caul births. The commonly quoted statistic is less than 1 in 80,000 live births. At this rate, many doctors, nurses, and midwives have never seen an en caul birth.¹

En caul births can happen with both vaginal and Cesarean deliveries. With a cesarean birth, the surgeon can attempt to deliver your baby in the bag without breaking it. However, this is not a typical surgical procedure.¹

An en caul birth is more likely with a preterm or small baby. They are also more common if you haven’t had any previous births.¹

Midwife Perspective

En caul births are not tracked at delivery, so any statistic is only an educated guess. I’ve been a midwife for 22 years and a labor and delivery nurse before that. I have not kept track of how many en caul deliveries I have done, but it’s between 5 to 10 vaginal births. I have delivered over 5,000 babies. These numbers do not match the 1 in 80,000 births estimate.

My numbers sparked my curiosity about how common en caul births are. So, I surveyed 71 United States nurses, midwives, and OBGYN doctors, and this is what I found:

• Who: The survey included 58 labor and delivery nurses, one director of nursing, seven midwives, and five OBGYN physicians. Experience levels varied among those surveyed, from under five to over 20 years.
• Percent: Of those surveyed, 80% have seen at least one en caul birth.
• Number: There was a wide range in the number of en caul births those surveyed had seen, from only one in over 20 years of experience to “countless” in less than 20 years of experience. The majority have seen one or two such births.

What I take away from this small survey is that there is a wide range of experience with en caul births. It happens more than the often-reported 1 in 80,000 births. More research can help determine accurate numbers.¹

Benefits of an En Caul Birth

The potential benefits of an en caul birth are largely related to the amniotic sac remaining intact during labor and delivery.²

When the sac stays intact, it may help reduce certain risks associated with early rupture, including the following:²

• uterine infection
• placental abruption, when the placenta pulls away too soon
• umbilical cord compression, leading to your baby not tolerating contractions

The most severe, umbilical cord compression happens in cord prolapse. A prolapse occurs when your baby’s umbilical cord falls through your cervix and into the vagina before your baby’s head. The cord gets squeezed between your baby’s head and the pelvic bones, depriving your baby of oxygen. This almost always leads to an emergency Cesarean delivery.⁸

Amniotic fluid provides a cushion around your baby. It helps protect your baby and the umbilical cord from squeezing and bruising during labor and birth. An en caul birth preserves this protection throughout the birthing process.⁹

Risks or Complications

While en caul births are generally considered safe, there are a few potential risks and considerations to be aware of.³

Overall, an en caul birth has few documented complications. One case study found a severely low number of blood cells (anemia) in a baby born by Cesarean via en caul delivery. However, the anemia was most likely caused by an abnormal umbilical cord, rather than the en caul delivery.³

If labor is not progressing, breaking the amniotic sac can stimulate labor. Your provider may recommend an internal fetal heart rate or contraction monitor. Either of these requires your water to be released. Hoping for an en caul birth could delay labor progress or recommended interventions and lead to complications.¹⁰

How to Increase Your Chance of an En Caul Birth

Labor must progress without breaking the amniotic sac to increase your chance of an en caul birth. It means not breaking your bag of water to speed things up if everything progresses normally. Induction of labor can make this difficult. You can still use Pitocin to stimulate contractions if needed.¹¹

Whenever you have a cervical check to evaluate your labor progress, your doctor or midwife’s fingers risk breaking the amniotic sac. Limiting vaginal exams can increase your chance of an en caul birth.¹²

It is essential to discuss your desires with your doctor or midwife. Many doctors routinely break the amniotic sac during labor. Even if you decline this intervention, your body may have its own plans, and there is little you can do to control when your water naturally breaks.

En caul births are fascinating, but there is still much to learn about how often they occur and their potential benefits or risks. When a baby is born encased in the amniotic sac, it offers a rare glimpse into life inside the womb. While this type of birth is generally safe, it is difficult to plan for. If you are curious about the possibility of an en caul birth, talk with your doctor or midwife about your preferences and expectations.