Can Preterm Birth Be Prevented?

Can preterm birth be prevented? Historically the answer has been no, and the numbers back that up. In 2006 the U.S. preterm birth rate was about 12 percent. In 2024 it was 10.4 percent. Medicine has gotten dramatically better at keeping premature babies alive, but almost no better at keeping pregnancies from ending early.

In this episode, Kristin and Dr. Abdelhak make the case that the answer is yes, preterm birth can be prevented far more often than it is now, and that the field has been looking in the wrong place.

Preterm birth is not one condition. It is a grab bag: placental abruption, systemic infection like appendicitis or pyelonephritis, uterine overdistension from twins, triplets, or polyhydramnios, trauma, severe hypertension, stimulant and cocaine use. Every one of those causes announces itself. The woman with triplets is obviously carrying triplets. The woman with an abruption is bleeding and in pain.

So what about the woman with none of that, doing everything right, who shows up at 30 weeks contracting and three centimeters dilated? For forty years the answer was "subclinical infection," a diagnosis Dr. Abdelhak takes apart in this episode. If it is subclinical, why is preterm labor the only clinical thing it ever does? Why does an appendicitis start with pain and fever and end in labor, while this mystery infection skips straight to the last step? And after four decades of amniocentesis studies cataloguing cytokines, interleukins, and prostaglandins, where is the treatment? There isn't one, because researchers found exactly what they went looking for.

His answer is mechanical, not microbial. The cervix is a timekeeper on the pregnancy. Conventional teaching says contractions open the cervix. He argues it runs the other way: the cervix quietly gives way over weeks, and when it opens far enough, labor starts. That is why he says he is almost never surprised by a preterm labor. He was already watching the cervix shorten.

Also covered: why previous preterm birth is the single strongest risk factor (it is the same cervix), why cone biopsy raises risk more than LEEP does, what funneling on ultrasound actually tells you, the difference between classic cervical insufficiency and the milder version that still lets you reach the third trimester, and why a three-hour precipitous labor at 38 weeks may be the same finding wearing a friendlier face.

The practical takeaway: serial cervical length measurement for anyone with a red flag, first-time moms included, and cerclage when the cervix starts to open. Screening plus treatment, not a pill for an infection nobody can find.

Plus: why the president and Taylor Swift would get their cervix measured every single week, and what that tells you about the standard of care the rest of us are offered.

Topics covered, in order

• Why this topic is worth repeating, and why the framing here is not the conventional one
• The better question: preventing preterm birth, not preterm labor
• Fifty years, the March of Dimes, and a rate that has barely moved
• What we did get better at: neonatal survival and outcomes, not prevention
• Preterm birth as a grab bag, not a single disease
• Placental abruption
• Systemic infection: appendicitis, pyelonephritis, sepsis, severe pneumonia, COVID
• The subclinical infection theory, and the case against it
• Why the amniocentesis and cytokine studies found what they set out to find
• Uterine overdistension: twins, triplets, polyhydramnios
• Trauma, decidual hemorrhage
• Severe hypertension, pulsatile flow, and abruption risk before 20 weeks
• Cocaine, methamphetamine, smoking
• The patient nobody can explain, and what is actually going on
• The core claim: dilation causes the contractions, not the other way around
• Why Dr. Abdelhak is rarely surprised by a preterm labor
• Mild cervical insufficiency, and "dreamlike" cervical insufficiency at 38 weeks
• Why previous preterm birth is the number one risk factor
• LEEP versus cone biopsy, and why cone matters more
• Normal variation in cervical length, and the big nose analogy
• Length is not everything: bulk, thickness, and how the cervix feels
• Funneling on ultrasound as a warning sign
• The proposal: serial cervical length screening plus cerclage
• Why the numbers are U.S. numbers, and why international rates are not trustworthy
• The VIP standard of care, and who actually gets weekly scans

Key takeaways

1. Preterm birth is not one condition. Abruption, systemic infection, overdistension, trauma, and severe hypertension each have their own mechanism, and each is usually obvious on arrival.
2. "Subclinical infection" is not a diagnosis, it is a placeholder. Forty years in, it has produced no treatment and no measurable drop in the preterm birth rate.
3. The cervix is the timekeeper. When it is weak, it opens slowly over weeks, and labor follows the opening rather than causing it.
4. Previous preterm birth predicts the next one because it is the same cervix. You cannot order a new one.
5. Cone biopsy raises preterm birth risk more than LEEP, because more cervix is removed.
6. Length is a clue, not a verdict. Plenty of women have naturally short cervixes and carry to term. Funneling, bulk, and change over time matter as much as a single number.
7. The intervention that would move the needle already exists. Serial cervical length measurement in anyone with a risk factor, and cerclage when it starts to open. Screening and treatment, not a mystery pill.

Terms mentioned

Placental abruption — the placenta separating from the uterine wall before delivery. Pyelonephritis — kidney infection. Polyhydramnios — too much amniotic fluid. Uterine overdistension — the uterus stretched beyond its comfortable capacity, as with twins or triplets. Cervical insufficiency — a cervix that opens without labor. Funneling — the cervix opening from the inside out, visible on ultrasound before any external change. Cerclage — a stitch placed to reinforce the cervix. LEEP and cone biopsy — procedures removing cervical tissue after abnormal Pap or HPV findings. Precipitous labor — a very fast labor, often under three hours.

Memorable quotes:

"I am telling you what happened was the three centimeters dilated caused the contractions."

"If it's subclinical, why doesn't it stay that way?"

"The cervix is a mechanical timekeeper on the pregnancy."

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