A patient-centered guide to understanding your risk and your options in a future pregnancy
⚠️ INFORMATIONAL USE ONLY — This tool does NOT provide medical advice. All clinical decisions must be made with a qualified healthcare provider.
Content based on ACOG Practice Bulletin No. 234 (2021), ACOG Practice Advisory (Updated April 2025), and SMFM guidelines.
Having had a spontaneous preterm birth in a previous pregnancy is the single most important risk factor for having another. Your risk is approximately 1.5 to 2 times higher than someone without this history. This does not mean another preterm birth will happen — it means your care team will monitor you more closely and discuss options to help reduce that risk.
It is also important to know that you are not at fault. Preterm birth is a complex medical condition with many contributing causes, including infection, inflammation, cervical factors, and structural issues. Many patients experience feelings of guilt or anxiety after a preterm birth — these feelings are understandable, but preterm birth is not a personal failure.
Risk assessment combines your obstetric history with findings from your current pregnancy, especially cervical length measured by transvaginal ultrasound. A cervix shorter than 25 mm before 24 weeks of pregnancy is associated with a higher risk of preterm birth and may change your management plan.
| Clinical Feature | What It Means |
|---|---|
| Prior spontaneous PTB | 1.5–2× increased recurrence risk ACOG PB 234 |
| Cervical length <25 mm before 24 wks | Significantly elevated risk; may change management SMFM |
| Short interpregnancy interval (<18 months) | Associated with increased PTB and low birth weight ACOG |
| Structural uterine or cervical anomalies | May contribute to cervical insufficiency ACOG |
| Multiple gestation (twins, triplets) | Substantially higher PTB risk independent of history SMFM |
| Infection / inflammation | Vaginal and urinary infections are associated with preterm labor ACOG |
Your provider will tailor a plan based on your specific history and findings. The major evidence-based options are:
Contact your provider immediately if you experience any of the following before 37 weeks:
Important: Over 70% of women admitted for "threatened preterm labor" do not deliver within seven days. A true diagnosis of preterm labor requires both regular contractions AND documented cervical change. Less than 10% of women presenting with symptoms will deliver within one week. ACOG PB 171
If you have had a preterm birth, spacing your next pregnancy at least 18 months after delivery is associated with better outcomes. Pregnancies spaced less than 6 months apart carry a higher risk of PTB and low birth weight. Your provider can discuss family planning options to help you time a future pregnancy optimally.
Experiencing a preterm birth can be emotionally difficult. Many patients describe feelings of guilt, anxiety, fatalism, or fear about future pregnancies. These feelings are completely understandable and valid. Research shows that patients do better when they receive clear, honest, personalized information about their specific risk — rather than vague reassurances. You deserve to understand your situation and to be an active partner in your care plan.
If you are struggling emotionally, please speak with your provider. Support resources, counseling, and peer support groups are available and can make a meaningful difference.