Evidence map›Paper›PMID 40251947›Full record

ArticleGut microbes2025

Delivery mode, birth order, and sex impact neonatal microbial colonization.

Katherine M Kennedy, Andreas Plagemann, Julia Sommer, Marie Hofmann, Wolfgang Henrich, Michael G Surette, Thorsten Braun, Deborah M Sloboda

Abstract read
In one paragraph

Article in Gut microbes, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers.

0numbers the graph read from it
0cells of the map it votes in
16citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

16 citing papers in PubMed.

  1. Review
  2. Article
  3. Review
  4. Review
  5. Review
  6. Review
  7. Article
  8. Review
  9. Review
  10. Article
  11. Review
  12. Review
  13. Article
  14. Article
  15. Article
  16. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

8 authors.

Katherine M KennedyDepartment of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Canada.ORCID 0000-0003-1240-9703
Andreas PlagemannDepartment of Obstetrics and Department of 'Experimental Obstetrics', Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany.
Julia SommerDepartment of Obstetrics and Department of 'Experimental Obstetrics', Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany.
Marie HofmannDepartment of Obstetrics and Department of 'Experimental Obstetrics', Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany.
Wolfgang HenrichDepartment of Obstetrics and Department of 'Experimental Obstetrics', Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany.
Michael G SuretteDepartment of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Canada.ORCID 0000-0003-0086-4995
Thorsten BraunDepartment of Obstetrics and Department of 'Experimental Obstetrics', Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany.
Deborah M SlobodaDepartment of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Canada.ORCID 0000-0002-7410-4756

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The initial microbial colonization of the infant gut during birth plays a critical role in shaping both immediate and long-term health outcomes. While mode of delivery is a known determinant of this colonization process, the potential impacts of infant sex and birth order remain underexplored. This study investigates the influence of delivery mode, infant sex, and birth order (maternal parity) on the microbial communities in first-pass meconium samples from neonates, using 16S rRNA gene sequencing. We found that delivery mode impacted the presence of detectable microbial communities. Specifically, only 17% of samples from neonates delivered by elective Cesarean section showed any microbial presence, compared to approximately two-thirds of samples from neonates exposed to maternal vaginal microbes (emergency C-section or vaginal delivery). Among vaginally delivered neonates without antibiotic exposure, birth order was associated with taxonomic shifts. Neonates born to primiparous mothers had a lower abundance of Bifidobacterium, a keystone species in the infant gut microbiome. Unexpectedly, the gut microbiota differed by infant sex, with males having lower alpha diversity and shifts in microbial community composition (PERMANOVA

Indexed as

BacteriaBirth OrderDelivery, ObstetricGastrointestinal MicrobiomeAdultCesarean SectionFemaleHumansInfant, NewbornMaleMeconiumPregnancyRNA, Ribosomal, 16SSex FactorsVaginaRNA, Ribosomal, 16Sbirth modebirth orderdelivery modefirst-pass meconiumGut microbiotainfant sexneonatal colonizationparity

Identifiers

PMID40251947
PMCPMC12013413

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.