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Prevalence of breech presentation by gestational age
1Department of Ultrasound, Magee-Womens Hospital, University of Pittsburgh School of Medicine, PA 15213.
American Journal of Perinatology
|January 1, 1990
Summary
Breech presentation in pregnancy is common early on but resolves spontaneously. This study tracked 4024 patients, finding breech presentation decreased from 24.4% at 28 weeks to 3.7% at 37 weeks gestation.
Area of Science:
- Obstetrics and Gynecology
- Fetal Medicine
- Perinatal Epidemiology
Background:
- Breech presentation, where the fetus is positioned lower extremities or buttocks first, is a common concern in late pregnancy.
- Understanding the natural resolution rate of breech presentation is crucial for optimizing birth outcomes and reducing interventions.
Purpose of the Study:
- To determine the prevalence and spontaneous resolution rate of breech presentation from 28 weeks gestation to term.
- To provide data on the natural course of fetal presentation in late pregnancy.
Main Methods:
- A prospective observational study involving 4024 consecutive patients.
- Data collection on fetal presentation at gestational age of 28 weeks and again at 37 weeks or delivery.
Main Results:
- The prevalence of breech presentation at 28 weeks gestation was 24.4%.
- By 37 weeks gestation, the prevalence of breech presentation significantly decreased to 3.7%.
Conclusions:
- The majority of breech presentations identified at 28 weeks gestation spontaneously resolve by 37 weeks.
- Late-term breech presentation is uncommon, suggesting that interventions before 37 weeks may not be necessary for many cases.