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The LITTLE OWLS Study (in German: "Kleine Eulen OWL"): Exploring the Early-life Microbiome Development and Physical and Mental Health Outcomes During Childhood. (LITTLE OWLS)

6 novembre 2026 aggiornato da: Univ.-Prof. Dr. med. Eckard Hamelmann, Bielefeld University

LITTLE OWLS Children's Health Study

The LITTLE OWLS study is a prospective, longitudinal birth cohort study investigating early-life microbiome development and its association with physical and mental health outcomes during childhood. Recruitment began in 2024, enrolling families from late pregnancy through the child's first 6 years of life, with a target of at least 1000- 1200 children and their families.

The study characterizes longitudinal microbiome trajectories-including resilience and dysbiosis-and their relationship to common chronic diseases. Data are collected via online surveys, symptom and medication diaries, annual clinical exams, and repeated biological sampling of the child, mother, father/partner, siblings, and household environment. Findings are intended to support future diagnostics, prevention, and therapy for common chronic physical and mental diseases.

Panoramica dello studio

Stato

Reclutamento

Condizioni

Descrizione dettagliata

Chronic physical and mental diseases in childhood are increasingly linked to early alterations in the human microbiome, yet the temporal dynamics of microbiome establishment across different body sites, family members, and environmental contexts remain incompletely understood. The LITTLE OWLS study addresses this gap through a prospective, longitudinal birth cohort design that follows families from late pregnancy through the child's sixth year of life.

Data collection:

  • Online surveys at 12 time points, capturing child and family health, medical history, and social, environmental, and lifestyle factors
  • Continuous symptom and medication diaries, allowing fine-grained tracking of the child's health trajectory between survey waves
  • Annual clinical examinations, providing standardized clinical assessments

Biological sampling:

  • Child: repeated sampling of the gut, skin, oral, nasal, and respiratory microbiome to capture developmental trajectories at multiple body sites
  • Mother: vaginal and gut microbiome samples, and lactation-related samples (e.g., human milk), which may inform understanding of microbial transmission from mother to child
  • Father/partner and siblings: biological samples from participating family members
  • Household environment: environmental samples (e.g., house dust)

Study objectives:

  • Characterize both stable (resilient) and disrupted (dysbiotic) patterns of microbiome development
  • Examine the temporal association between these patterns and the emergence of common chronic diseases
  • Identify microbial and environmental markers linked to disease risk
  • Help clarify the potential causal role of these markers in health outcomes Beyond its immediate research aims, the cohort is intended to serve as a long-term resource for the field, providing a foundation for the development of improved diagnostic approaches, prevention strategies, and targeted therapies for common chronic physical and mental diseases affecting children.

Tipo di studio

Osservativo

Iscrizione (Stimato)

1200

Contatti e Sedi

Questa sezione fornisce i recapiti di coloro che conducono lo studio e informazioni su dove viene condotto lo studio.

Contatto studio

Luoghi di studio

      • Bielefeld, Germania, 33617
        • Reclutamento
        • University Hospital OWL, Bielefeld University, Department for Pediatrics
        • Contatto:

Criteri di partecipazione

I ricercatori cercano persone che corrispondano a una certa descrizione, chiamata criteri di ammissibilità. Alcuni esempi di questi criteri sono le condizioni generali di salute di una persona o trattamenti precedenti.

Criteri di ammissibilità

Età idonea allo studio

Da 1 secondo a 2 settimane (Bambino)

Accetta volontari sani

Sì

Sessi ammissibili allo studio

Tutto

Metodo di campionamento

Campione non probabilistico

Popolazione di studio

1000-1200 children born in Bielefeld (Germany) and surrounding area (≤ 40 km) and their families (mothers, optional: fathers, siblings).

Descrizione

Participation of both mother and child (newborn) is mandatory; participation of the father and siblings is optional.

Inclusion Criteria:

  • mothers age ≥18 years at the time of enrollment
  • newborn age: max. 14 days after birth at the time of enrollment
  • sufficient proficiency in the study language (German)
  • residence ≤ 40 km from Bielefeld city center, to ensure feasibility of long-term follow-up

Exclusion Criteria:

  • no written study consent
  • no ability to participate in the study (incl. self-sampling, online-questionnaires, study visits) according to the investigator´s instructions

Piano di studio

Questa sezione fornisce i dettagli del piano di studio, compreso il modo in cui lo studio è progettato e ciò che lo studio sta misurando.

Come è strutturato lo studio?

Dettagli di progettazione

  • Modelli osservazionali: COHORT
  • Prospettive temporali: PROSPECTIVE

Cosa sta misurando lo studio?

Misure di risultato primarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Longitudinal gut microbiome development (composition and diversity) in children
Lasso di tempo: 2-14 days, 4 weeks, 3 month, 6 month, 1-6 years (annually)

Analysis of microbiota composition, diversity, (function) using next-generation sequencing (primarily: 16S rRNA- amplicon sequencing; partially: ITS-amplicon sequencing, whole metagenome shotgun sequencing).

2-14 days, 4 weeks, 3 month, 6 month, 1-6 years (annually)
Longitudinal gut metabolome development in children
Lasso di tempo: 2-14 days, 4 weeks, 3 month, 6 month, 1-6 years (annually)

Fecal metabolome analysis using targeted/ untargeted mass-spectrometry methods.

2-14 days, 4 weeks, 3 month, 6 month, 1-6 years (annually)
Longitudinal skin microbiome development (composition and diversity) in children
Lasso di tempo: 2-14 days, 1-6 years (annually)

Analysis of microbiota composition, diversity, (function) using next-generation sequencing (primarily 16S rRNA- amplicon sequencing; partially: ITS-amplicon sequencing, whole metagenome shotgun sequencing).

2-14 days, 1-6 years (annually)
Longitudinal oral microbiome development (composition and diversity) in children
Lasso di tempo: 2-14 days, 4 weeks, 3 month, 6 month, 1-6 years (annually)

Analysis of microbiota composition and diversity using next-generation sequencing (primarily 16S rRNA- amplicon sequencing; partially: ITS-amplicon sequencing, whole metagenome shotgun sequencing).

2-14 days, 4 weeks, 3 month, 6 month, 1-6 years (annually)
Longitudinal respiratory microbiome development (composition and diversity) in children
Lasso di tempo: 1-6 years (annually)

Analysis of microbiota composition and diversity using next-generation sequencing (primarily 16S rRNA- amplicon sequencing; partially: ITS-amplicon sequencing, whole metagenome shotgun sequencing).

1-6 years (annually)
Longitudinal nasal microbiome development (composition and diversity) in children
Lasso di tempo: 2-14 days, 4 weeks, 3 month, 6 month, 1-6 years (annually)

Analysis of microbiota composition and diversity using next-generation sequencing (primarily 16S rRNA- amplicon sequencing; partially: ITS-amplicon sequencing, whole metagenome shotgun sequencing).

2-14 days, 4 weeks, 3 month, 6 month, 1-6 years (annually)

Misure di risultato secondarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Short-term changes in the gut microbiome composition and diversity in children after antibiotic exposure
Lasso di tempo: during medication (up to last day of medication) - 4 weeks after medication (when occurring between birth- 6 years)

Changes in gut microbiome composition, diversity, (function) following perturbations by antibiotic use analyzed by next-generation sequencing (primarily 16S rRNA- amplicon sequencing; partially: ITS-amplicon sequencing, whole metagenome shotgun sequencing).

during medication (up to last day of medication) - 4 weeks after medication (when occurring between birth- 6 years)
Short-term changes in the gut microbiome composition and diversity in children after gastrointestinal infections.
Lasso di tempo: during infection (up to 7 days) - 4 weeks after infection (when occurring between birth- 6 years)

Changes in gut microbiome composition, diversity, (function) following perturbations by gastrointestinal infections analyzed by next-generation sequencing (primarily 16S rRNA- amplicon sequencing; partially: ITS-amplicon sequencing, whole metagenome shotgun sequencing).

during infection (up to 7 days) - 4 weeks after infection (when occurring between birth- 6 years)
Number of children with allergic diseases
Lasso di tempo: 1-6 years (annually)

Physician-diagnosed allergy (wheeze, allergic rhinitis, food allergy). From 2-years of age allergic symptoms are further recorded during the annual study examinations using the ISAAC questionnaire.

1-6 years (annually)
Number of children with atopic dermatitis/ eczema
Lasso di tempo: 1-6 years (annually)

Physician-diagnosed atopic dermatitis/ eczema. From 1-year of age the skin status of each study child is further screened based on SCORAD (SCORing Atopic Dermatitis). The score evaluates three distinct areas: extend, intensity, subjective symptoms. The overall score ranges from 0 to 103: < 25: Mild Atopic Dermatitis, 25 - 50: Moderate Atopic Dermatitis, > 50: Severe Atopic Dermatitis.

1-6 years (annually)
Number of children with asthma.
Lasso di tempo: 1-6 years (annually)

Physician-diagnosed asthma. From 2-years of age, asthmatic symptoms are further recorded during the annual study examinations using the International Study of Asthma and Allergies in Childhood (ISAAC) questionnaire (calculating the percentage frequencies of wheezing, eczema, and rhinitis symptoms over the last 12 month).

1-6 years (annually)
Number of children with overweight/ obesity (BMI-calculation)
Lasso di tempo: 1-6 years (annually)

Physician-diagnosed overweight or obesity. Further the Body Mass Index (kg/m²) is calculated for each study child (annually) as weight (kg) divided by the square of length or height (in meters).

1-6 years (annually)
Number of children with functional gastrointestinal disorders
Lasso di tempo: 1-6 years (annually)

Physician-diagnosed functional gastrointestinal disorders (like chronic constipation, diarrhea or irritable bowel syndrome (IBS). From 1-year of age, functional gastrointestinal symptoms are further recorded during the annual study examinations using the R4PDQ questionnaires (Rome foundation) according to the Rome IV criteria (1-3 years; 4 years +). The R4DQ uses a mix of Likert-type scales, yes/no, and multiple-choice questions to assess symptom severity and frequency. Scoring varies by module, with no universal cut-off scores.

1-6 years (annually)
Infection rate of the study child
Lasso di tempo: 1-6 years (annually)

Number of respiratory, gastrointestinal, ear/ eye or urinary tract infections per year

1-6 years (annually)
Bowel habits of the study child
Lasso di tempo: 2-14 days, 4 weeks, 3 month, 6 month, 1-6 years (annually)

Bowel habits measured by stool frequency, stool consistency and stool colour. Bowel habit information and Bristol Stool Scale scores are documented with each fecal sample collection (Type 1-7, hard-watery).

2-14 days, 4 weeks, 3 month, 6 month, 1-6 years (annually)
General health status of the study child
Lasso di tempo: 1-6 years (annually)

Number of health care visits, hospitalizations, or disease diagnoses per year.

1-6 years (annually)
Body Weight
Lasso di tempo: Birth, 2-14 days, 4 weeks, 3 month, 6 month, 1-6 years (annually)

Weight in kg.

Birth, 2-14 days, 4 weeks, 3 month, 6 month, 1-6 years (annually)
Growth
Lasso di tempo: Birth, 2-14 days, 4 weeks, 3 month, 6 month, 1-6 years (annually)

Height in cm

Birth, 2-14 days, 4 weeks, 3 month, 6 month, 1-6 years (annually)
Head Circumference
Lasso di tempo: Birth, 2-14 days, 4 weeks, 3 month, 6 month, 1-6 years (annually)

Head circumference in cm

Birth, 2-14 days, 4 weeks, 3 month, 6 month, 1-6 years (annually)
Child developmental milestones
Lasso di tempo: 1-6 years (annually)

Child developmental milestones are examined during the annual study visits using pediatric questionnaires (German: "Grenzsteine der kindlichen Entwicklung") for cognitive, motor, socio-emotional and verbal development.

1-6 years (annually)
Bonding between mother and child
Lasso di tempo: 4 weeks

Mother-infant bonding is assessed at 4 weeks after birth using the Postpartum Bonding Questionnaire (PBQ). The PBQ uses a 6-point Likert scale (0 = Always to 5 = Never), yielding a maximum total score of 125. High scores indicate greater bonding difficulties, while low scores indicate a healthy mother-infant relationship.

4 weeks
Infant temperament
Lasso di tempo: 6 month

The infant temperament development of the child is examined using the Infant Behavior Questionnaire (IBQ) at 6 month of age. Parents rate behaviors observed over the past week or two on a 7-point Likert scale (from 1 = never to 7 = always, plus a "does not apply" option). Scale scores are calculated as the mean score of all applicable items answered (excluding "does not apply" choices). Scores are independently rated for each of the 6 Core Temperament Dimensions: Activity Level, Soothability, Fear, Distress to Limitations, Smiling and Laughter, Duration of Orienting. Higher mean scores indicate a greater frequency of that specific behavioral temperament trait.

6 month
Infant crying behaviour
Lasso di tempo: 6 month

The infant crying behaviour is examined using the Infant Behavior Questionnaire (IBQ) at 6 month of age. Parents rate behaviors observed over the past week or two on a 7-point Likert scale (from 1 = never to 7 = always, plus a "does not apply" option). Scale scores are calculated as the mean score of all applicable items answered (excluding "does not apply" choices). Scores are independently rated for each of the 6 Core Temperament Dimensions: Activity Level, Soothability, Fear, Distress to Limitations, Smiling and Laughter, Duration of Orienting. Higher mean scores indicate a greater frequency of that specific behavioral temperament trait.

6 month
Child coping
Lasso di tempo: 1-6 years (annually)

Coping behaviour of children is assessed annually using the Emotional regulation/ impulse management questionnaire (IMMA-6 short version) starting from 1 year of age. The calculation of results follows standard psychometric scoring rules for 6-point Likert-scale questionnaires. The three main scales (core dimensions) are evaluated: 1) Child's Self-Regulation (C-Scale), 2) Parental Co-Regulation (P-Scale), 3) Parental Expectations/Goals (E-Scale)

1-6 years (annually)
Child emotional regulation
Lasso di tempo: 1-6 years (annually)

Emotional regulation of children is assessed annually using the Pediatric Symptom Checklist (IMMA) starting from 1 year of age. The calculation of results follows standard psychometric scoring rules for 6-point Likert-scale questionnaires. The three main scales (core dimensions) are evaluated: 1) Child's Self-Regulation (C-Scale), 2) Parental Co-Regulation (P-Scale), 3) Parental Expectations/Goals (E-Scale)

1-6 years (annually)
General psychosocial functioning in children
Lasso di tempo: 2-6 years (annually)

General psychosocial functioning in children (and potential emotional and behavioral difficulties) is examined using the Pediatric Symptom Checklist (PSC-35). The Pediatric Symptom Checklist (PSC) is scored by assigning points to each response (0 for "never", 1 for "sometimes", and 2 for "often") calculating a total score. A total score of 24 or higher (from 3-6 years) indicates a positive screening result for psychosocial impairment. If four or more items are left blank, the questionnaire is considered invalid and cannot be scored.

2-6 years (annually)

Altre misure di risultato

Misura del risultato
Misura Descrizione
Lasso di tempo
Maternal gut microbiome composition and diversity
Lasso di tempo: 3rd trimester of pregnancy, birth; only for breast-feeding mothers: 2-14 days, 4 weeks, 3 month, 6 month, annually (individual, until end of lactation period, assessed up to max. 5 years)

Analysis of microbiota composition, diversity, (function) using next-generation sequencing (primarily: 16S rRNA- amplicon sequencing; partially: ITS-amplicon sequencing, whole metagenome shotgun sequencing). The mothers' stool samples will continue to be collected annually after the first year of life until the end of the breastfeeding period (on an individual basis for each mother). In addition, a stool sample will be collected and analyzed 1-3 days after the last breastfeeding session and 4 weeks thereafter.

3rd trimester of pregnancy, birth; only for breast-feeding mothers: 2-14 days, 4 weeks, 3 month, 6 month, annually (individual, until end of lactation period, assessed up to max. 5 years)
Maternal gut metabolome
Lasso di tempo: 3rd trimester of pregnancy, only for breast-feeding mothers: 2-14 days, 4 weeks, 3 month, 6 month, annually (individual, until end of lactation period, assessed up to max. 5 years)

Fecal metabolome analysis using targeted/ untargeted mass-spectrometry methods.

3rd trimester of pregnancy, only for breast-feeding mothers: 2-14 days, 4 weeks, 3 month, 6 month, annually (individual, until end of lactation period, assessed up to max. 5 years)
Human milk microbiome composition and diversity
Lasso di tempo: 2-14 days, 4 weeks, 3 month, 6 month, annually (individual, until end of lactation period, assessed up to max. 5 years)

Analysis of microbiota composition, diversity, (function) using next-generation sequencing (primarily: 16S rRNA- amplicon sequencing; partially: ITS-amplicon sequencing, whole metagenome shotgun sequencing). The mothers' milk samples will continue to be collected annually after the first year of life until the end of the breastfeeding period (on an individual basis for each mother).

2-14 days, 4 weeks, 3 month, 6 month, annually (individual, until end of lactation period, assessed up to max. 5 years)
Human milk metabolome
Lasso di tempo: 2-14 days, 4 weeks, 3 month, 6 month, annually (individual, until end of lactation period, assessed up to max. 5 years)

Human milk metabolome analysis using targeted/ untargeted mass-spectrometry methods.

2-14 days, 4 weeks, 3 month, 6 month, annually (individual, until end of lactation period, assessed up to max. 5 years)
Maternal vaginal microbiome composition and diversity
Lasso di tempo: 3rd trimester of pregnancy

Analysis of microbiota composition, diversity, (function) using next-generation sequencing (primarily: 16S rRNA- amplicon sequencing; partially: ITS-amplicon sequencing, whole metagenome shotgun sequencing).

3rd trimester of pregnancy
Parental perceived stress
Lasso di tempo: 3rd trimester of pregnancy, 4 weeks, 3 month, 6 month, 1-6 years (annually)

Parental mental health is analysed for perceived stress using the Perceived Stress Scale Questionnaire (PSS-10). The PSS-10 evaluates how unpredictable, uncontrollable, and overloaded a person has found their life over the past month. The final total score will range from 0 to 40. Higher point values represent a higher level of perceived stress.

3rd trimester of pregnancy, 4 weeks, 3 month, 6 month, 1-6 years (annually)
Parental depression
Lasso di tempo: 3rd trimester of pregnancy, 4 weeks, 3 month, 6 month, 1-6 years (annually)

Parental mental health is analysed for depression using the Patient Health Questionnaire (PHQ-9). The PHQ-9 scores depressive symptom severity over the past two weeks using a 0 to 27 point scale. A score of 10 or higher is generally considered the threshold for a positive screening, warranting further clinical evaluation.

3rd trimester of pregnancy, 4 weeks, 3 month, 6 month, 1-6 years (annually)
Parental anxiety
Lasso di tempo: 3rd trimester of pregnancy, 4 weeks, 3 month, 6 month, 1-6 years (annually)

Parental mental health is analysed for anxiety using the Generalized Anxiety Disorder scale (GAD-7). The GAD-7 scoring and analysis scheme calculates a single cumulative severity score ranging from 0 to 21 by summing the ratings of seven individual items. The Cut-Off of ≥ 10 serves as the standard threshold for identifying probable cases of Generalized Anxiety Disorder.

3rd trimester of pregnancy, 4 weeks, 3 month, 6 month, 1-6 years (annually)

Collaboratori e investigatori

Qui è dove troverai le persone e le organizzazioni coinvolte in questo studio.

Sponsor

Collaboratori

Pubblicazioni e link utili

La persona responsabile dell'inserimento delle informazioni sullo studio fornisce volontariamente queste pubblicazioni. Questi possono riguardare qualsiasi cosa relativa allo studio.

Collegamenti utili

Studiare le date dei record

Queste date tengono traccia dell'avanzamento della registrazione dello studio e dell'invio dei risultati di sintesi a ClinicalTrials.gov. I record degli studi e i risultati riportati vengono esaminati dalla National Library of Medicine (NLM) per assicurarsi che soddisfino specifici standard di controllo della qualità prima di essere pubblicati sul sito Web pubblico.

Studia le date principali

Inizio studio (Effettivo)

1 marzo 2024

Completamento primario (Stimato)

1 marzo 2036

Completamento dello studio (Stimato)

1 marzo 2037

Date di iscrizione allo studio

Primo inviato

6 ottobre 2026

Primo inviato che soddisfa i criteri di controllo qualità

6 novembre 2026

Primo Inserito (Effettivo)

13 novembre 2026

Aggiornamenti dei record di studio

Ultimo aggiornamento pubblicato (Effettivo)

13 novembre 2026

Ultimo aggiornamento inviato che soddisfa i criteri QC

6 novembre 2026

Ultimo verificato

1 novembre 2026

Maggiori informazioni

Termini relativi a questo studio

Altri numeri di identificazione dello studio

  • LittleOwls_2022-600-f-S
  • 03LW0567K (Altro numero di sovvenzione/finanziamento: BMFTR, German Federal Ministry of Research, Technology and Space)

Piano per i dati dei singoli partecipanti (IPD)

Hai intenzione di condividere i dati dei singoli partecipanti (IPD)?

SÌ

Informazioni su farmaci e dispositivi, documenti di studio

Studia un prodotto farmaceutico regolamentato dalla FDA degli Stati Uniti

No

Studia un dispositivo regolamentato dalla FDA degli Stati Uniti

No

Queste informazioni sono state recuperate direttamente dal sito web clinicaltrials.gov senza alcuna modifica. In caso di richieste di modifica, rimozione o aggiornamento dei dettagli dello studio, contattare register@clinicaltrials.gov. Non appena verrà implementata una modifica su clinicaltrials.gov, questa verrà aggiornata automaticamente anche sul nostro sito web .