Clinical trial Recruiting at 1 site Phase 1 Interventional Ages 18 and up Women only

Restoring gut bacteria in infants born by cesarean section

Official title: "Restoration of the Gut Microbiome After Cesarean Section (RestoreGut)" - A Double-blinded Randomized Placebo-controlled Trial

Run by Copenhagen Studies on Asthma in Childhood · NCT06264219 · Data updated 2026-11-12

This study is testing a new treatment to help restore healthy gut bacteria in infants born by cesarean section to see if it can improve their immune system development.

Quick facts

PhasePhase 1
Study typeInterventional
Ages18 Years and up
SexWomen only
Enrollment80 (estimated)
SponsorCopenhagen Studies on Asthma in Childhood
Academic / other
Locations2 sites (Gentofte Municipality, Copenhagen and 1 other locations)
StatusRecruiting
StartedAugust 2, 2024
Main results expectedAugust 30, 2027
Study endsAugust 30, 2027
Registry record updatedOctober 7, 2026
Trial IDNCT06264219 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates for this study are infants born via cesarean section who are less than 38 weeks gestational age and whose mothers meet specific health criteria.

Probably not a fit

Patients who may not benefit from this study include those with chronic health conditions or those who have recently used antibiotics.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This study aims to develop a therapy to restore the gut microbiome in infants born via cesarean section (CS) by conducting a randomized, placebo-controlled feasibility trial. The intervention involves mother-to-infant fecal microbiota transplantation (FMT) and virome transfer (FVT) to help correct microbial imbalances caused by CS delivery. The study will assess whether these interventions can help the infants' microbiomes resemble those of vaginally born infants, which may support healthier immune system development. The trial will include infants born at less than 38 weeks gestation and will monitor various health outcomes related to microbial colonization.

Why it matters

Potential benefit: If successful, this approach could lead to improved gut health and immune function in infants born via cesarean section.

How similar studies have gone: Other studies have shown promise in using microbiome restoration techniques, but this specific approach is novel and untested.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Gestational age \< week 38+0 days
* Proficient in spoken/written Danish
* Single pregnancy (no twins or triplets)
* Pre-pregnancy BMI between 18.5 and 35 kg/m2
* No chronic intestinal, endocrine, cardiac, or kidney disorders
* No known gestational complications (gestational diabetes, preeclampsia, gestational hypothyroidism)
* No regular use of prescription medication or any drugs that, in the research team's opinion, may interfere with the study's results.
* Willingness to abstain from giving the child products with probiotics (fermented dairy like yogurt or A38 are allowed).

Exclusion Criteria:

Maternal:

* Use of antibiotics within one month of stool donation
* Acute gastroenteritis within one month of stool donation
* Use of antibiotics within one month of birth
* Time since last travel abroad relative to data of fecal donation according to the requirements for blood donations ("Regler for tappepauser" - blooddonor.dk)
* Positive test results for pathogens during donor material screening.
* Antibiotic treatment at birth (vaginal births only)
* Spontaneous onset of labor or emergency cesarean section before scheduled cesarean section.

Infant:

* Instances of major birth defects or intrauterine growth retardation (IUGR)
* Infants requiring pediatric support at the time of transplant administration

Where it's running

  • Copsac, DBAC
    Gentofte Municipality, Copenhagen, Denmark
    Recruiting
  • Rigshospitalet
    Copenhagen, Denmark
    Not yet recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.