Individualized Reconstitution of Human Milk Microbiota: A Feasible Approach in Real-World Settings
February 7th, 2025
The article describes a protocol for reconstituting pasteurized donor milk microbiota using the mother's own milk microbiota in practical, real-world settings. It demonstrates effective bacterial growth and microbiome modulation, supporting the feasible application of this procedure within the routine care of a maternity hospital and its associated human milk bank.
We are investigating whether it's possible to recover the microbiota of a specific mother's milk preserving nutritional structure in pasteurized milk through methodology that can be implemented in hospitals. Our goal is to develop a new nutritional super strategy for newborns and assess its visibility. We believe that the greatest challenge in reconstituting the human milk microbiota experimentally is achieving a reconstruction that is even closer to the original profile present in the mother's milk, and doing so quickly.
This will not only enhance its effects, but also further increase the safety of the procedure. We aim to determine whether these new nutritional super strategy offers significant clinical benefits for neonates. We believe that if practical benefits are confirmed, the strategy could be easily implemented in all regions with human milk banks leading to a positive impact on overall non-adult health.
After obtaining the required consent, have the mother express milk using an electric breast pump into a sterilized container under the supervision of the nurse. After collection, label the container holding the milk with the mother's information, the date, and the time of collection. Store the mother's own milk or MOM at minus four degrees Celsius or lower for up to 12 hours.
Thaw raw milk or pasteurized donor milk or PDM, stored in sterilized glass containers with plastic lids in a 40 degree Celsius water bath. Remove the human milk bottle from the water bath before the milk temperature exceeds five degrees Celsius. Next, wear a lab coat, mask, cap, and gloves.
Clean the work surface with a surface cleaning solution, following the local institutional protocol. Transfer the aliquot of up to one milliliter of the MOM into a cryotube for subsequent 16S sequencing and bacterial count. Store the cryotube at minus 80 degrees Celsius.
Using a sterile pipette, transfer the remaining volume of MOM, equivalent to 10%of the final desired volume, to a food safe container. Immerse the container in a water bath at 37 degrees Celsius. Next, transfer the one milliliter aliquot of the PDM into a DNase/RNase Free cryotube for 16S sequencing and bacterial count.
Store the cryotube at minus 80 degrees Celsius. Using a sterile pipette, transfer an amount of PDM equivalent to 90%of the final desired volume to the container holding the MOM, forming the inoculated mother's milk. Seal the container with a lid to prevent contamination and immerse it in a 37 degree Celsius water bath for four hours to allow microorganisms to multiply in the milk.
After four hours, remove the container with the fermented inoculated mother's milk from the water bath. Transfer the one milliliter aliquot of the reconstituted milk into a DNase/RNase Free cryotube for 16S sequencing and bacterial count. Store the cryotube at minus 80 degrees Celsius.
Transfer the remaining volume of reconstituted milk to a sanitized container for feeding newborns.
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Overview
This article presents a protocol for reconstituting pasteurized donor milk microbiota using the mother's own milk microbiota. It highlights effective bacterial growth and microbiome modulation, demonstrating the practical application of this method in maternity hospitals and human milk banks.
Key Study Components
Area of Science
- Microbiology
- Neonatology
- Human Milk Banking
Background
- The microbiota of human milk is crucial for neonatal health.
- Reconstituting microbiota can enhance the nutritional profile of pasteurized milk.
- Current methods may not fully replicate the original mother's milk microbiota.
- Implementing this protocol could improve outcomes for newborns in hospital settings.
Purpose of Study
- To develop a method for recovering the microbiota of a specific mother's milk.
- To assess the clinical benefits of this reconstitution for neonates.
- To facilitate the implementation of this strategy in human milk banks.
Methods Used
- Collection of mother's milk under sterile conditions.
- Thawing and preparation of pasteurized donor milk.
- Inoculation of pasteurized donor milk with mother's own milk.
- Storage and bacterial analysis of reconstituted milk.
Main Results
- Successful growth of bacteria in reconstituted milk.
- Demonstration of microbiome modulation through the protocol.
- Feasibility of implementing the method in routine hospital care.
- Potential for significant clinical benefits for newborns.
Conclusions
- The protocol supports the safe reconstitution of mother's milk microbiota.
- It can be easily adopted in maternity hospitals with human milk banks.
- Further research is needed to confirm long-term benefits for neonatal health.
Frequently Asked Questions
Executive Industry Relevance
Restoring the microbiota of pasteurized donor human milk (PDM) using a mother's own milk (MOM) addresses a critical gap in neonatal nutrition by reintroducing beneficial commensal bacteria lost during pasteurization. This individualized reconstitution protocol enhances the biological fidelity of donor milk, supporting predictive confidence in nutritional and immunological outcomes for preterm infants. The approach is positioned to impact early-life microbiome establishment, a key inflection point for long-term health and development in neonatal care portfolios.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Enables interrogation of the functional impact of restored milk microbiota on neonatal health.
- Supports biological de-risking by closely replicating the original MOM microbiota profile in PDM.
- Facilitates predictive confidence in translational studies of microbiome-driven interventions.
Screening & Assay Development
- Provides a validated workflow for preparing reconstituted milk samples for downstream microbiological and sequencing assays.
- Standardizes inoculation and incubation parameters to ensure reproducibility across clinical and research settings.
- Generates quantitative outputs via bacterial counts and 16S sequencing for robust assay development.
Translational & Preclinical Research
- Aligns with disease-relevant models by enabling studies on the impact of milk microbiota on neonatal immune and metabolic development.
- Supports continuity from discovery through preclinical validation of microbiome restoration strategies.
- Provides mechanistic de-risking for interventions targeting early-life microbiome establishment.
Pipeline & Workflow Integration
This protocol integrates into the discovery-to-preclinical continuum by enabling hypothesis testing on microbiota restoration, supporting lead identification for nutritional interventions, and informing translational research in neonatal health.
- Discovery Biology: Facilitates hypothesis-driven studies on the role of milk microbiota in neonatal outcomes.
- Screening: Delivers reproducible, quantitative microbiological and sequencing readouts for condition comparison.
- Analytics: Enables statistical analysis of bacterial growth and microbiota profiles across sample types.
- Translational Research: Bridges discovery findings to preclinical models of neonatal nutrition and immunity.
- Enterprise Reuse: Establishes a scalable, standardized protocol adaptable to diverse clinical and research environments.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence in microbiome restoration and target validation for neonatal nutrition.
- Operational Value: Promotes standardization, reproducibility, and scalability in milk microbiota reconstitution workflows.
- Strategic Value: Informs go/no-go decisions for advancing microbiome-based nutritional interventions.
- Portfolio Impact: Supports risk-adjusted prioritization of neonatal health strategies within R&D pipelines.
Implementation Considerations
- Requires expertise in sterile technique, microbiological analysis, and sequencing workflows.
- Needs access to clinical-grade milk collection, storage, and incubation infrastructure.
- Demands cross-team standardization for sample handling and data analysis.
- Adaptable to various hospital and milk bank settings with appropriate training.
- Dependent on availability of MOM and compliance with biosafety protocols.
