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Am J Perinatol
DOI: 10.1055/a-2682-6209
Original Article

Severe Neonatal Morbidity in Forceps versus Vacuum Birth among Individuals with Previous Cesarean Birth: A Population-Based Retrospective Cohort Study

Irina I. Oltean 
1   Department of Health Research Methods, Evidence and Impact, Faculty of Health Sciences, McMaster University, Hamilton, Canada
,
Abirami Kirubarajan
1   Department of Health Research Methods, Evidence and Impact, Faculty of Health Sciences, McMaster University, Hamilton, Canada
2   Department of Obstetrics and Gynecology, Faculty of Health Sciences, McMaster University, Hamilton, Canada
,
Vanessa Hébert
1   Department of Health Research Methods, Evidence and Impact, Faculty of Health Sciences, McMaster University, Hamilton, Canada
,
Elizabeth K. Darling
1   Department of Health Research Methods, Evidence and Impact, Faculty of Health Sciences, McMaster University, Hamilton, Canada
3   Department of Obstetrics and Gynecology, McMaster Midwifery Research Centre, Faculty of Health Sciences, McMaster University, Hamilton, Canada
,
Rohan D'Souza
1   Department of Health Research Methods, Evidence and Impact, Faculty of Health Sciences, McMaster University, Hamilton, Canada
2   Department of Obstetrics and Gynecology, Faculty of Health Sciences, McMaster University, Hamilton, Canada
,
Giulia M. Muraca 
1   Department of Health Research Methods, Evidence and Impact, Faculty of Health Sciences, McMaster University, Hamilton, Canada
2   Department of Obstetrics and Gynecology, Faculty of Health Sciences, McMaster University, Hamilton, Canada
4   Clinical Epidemiology Unit, Department of Medicine, Solna, Karolinska Institutet, Eugeniahemmet, Stockholm, Sweden
› Author Affiliations
Funding Information This research was supported by the Marta and Owen Boris Foundation. The funders had no role in the conceptualization or analysis of the study. R.D. holds a Tier-2 Canada Research Chair in Maternal Health (grant no.: CRC-2021-00337).
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Abstract

Objective

We sought to compare severe neonatal morbidity associated with forceps versus vacuum birth among individuals with prior cesarean birth.

Study Design

We conducted a population-based retrospective cohort study using data on all full term, singleton, cephalic vaginal births among individuals with prior cesarean birth in the United States (2014–2021). The exposure was operative vaginal birth (forceps vs. vacuum) and the primary outcome was composite severe neonatal morbidity, defined as assisted ventilation > 6 hours, neonatal seizures, and Apgar score < 4 at 5 minutes. We primarily compared the distribution of severe neonatal morbidity among operative vaginal births by instrument (forceps compared with vacuum) and fit multivariable logistic regression models to obtain adjusted odds ratios (AORs) and 95% confidence intervals (CIs) for severe neonatal morbidity in forceps versus vacuum births while accounting for confounders.

Results

The study population included 531,440 births. The rate of severe neonatal morbidity was 0.7% with spontaneous vaginal birth, 1.6% with forceps, and 1.3% with vacuum. Adjusted models showed higher rates of severe neonatal morbidity with forceps versus vacuum birth, but this association was not statistically significant (AOR: 1.20, 95% CI: 0.96, 1.50). Analysis of each component of the severe neonatal morbidity composite showed a 39% higher odds of assisted ventilation > 6 hours (AOR: 1.39, 95% CI: 1.07, 1.80) in forceps compared with vacuum births.

Conclusion

Rates of severe neonatal morbidity are higher following operative versus spontaneous vaginal births with no difference based on type of instrument (forceps or vacuum). The choice between instrument should depend on the clinical situation, patient preference, and the experience, skill, and comfort of the operator.

Key Points

  • Rates of severe neonatal morbidity are higher following operative versus spontaneous vaginal births.

  • No difference in severe neonatal morbidity exists based on type of instrument (forceps or vacuum).

  • The choice between instrument should depend on the clinical situation and patient preference.

Keywords

pregnancy - infant - newborn - vacuum extraction - obstetrical - obstetrical forceps - birth - obstetric - obstetrical surgical instruments - morbidity

Contributors' Statement

I.I.O.: conceptualization, methodology, investigation, data curation, formal analysis, writing—original draft. A.K.: investigation, writing—review and editing. V.H.: investigation, writing—review and editing. E.K.D.: investigation, writing—review and editing. R.D.: conceptualization, methodology, investigation, writing—review and editing. G.M.: conceptualization, methodology, supervision, writing—review and editing.


Note

Any analyses, interpretations, or conclusions are reached by the author (recipient of the data file) and not to NCHS, which was responsible only for the initial data.

Supplementary Material is available at https://doi.org/10.1055/a-2682-6209


Affiliation addresses are listed at the end of the article.


Supplementary Material



Publication History

Received: 15 April 2025

Accepted: 13 August 2025

Article published online:
27 August 2025

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