Antibiotics for Breastfeeding Mothers: Understanding Impact on Milk, Babies, and Gut Health

Antibiotic Treatment in Breastfeeding Mothers: Effects on Milk, Microbiome, and Infant Outcomes

NIH-funded research University of California, San Diego · NIH-11143899

This research aims to understand how common antibiotics taken by breastfeeding mothers might affect their breast milk, their baby's gut health, and the baby's overall development.

Quick facts

Grant typeNIH-funded research
Study typeNIH-funded research
Funding institutionUniversity of California, San Diego NIH-funded
Lab location1 site (La Jolla, United States)
Project IDNIH-11143899 on NIH RePORTER

What this research studies

We want to learn more about how antibiotics pass into breast milk and what changes they might cause in the milk's nutrients and beneficial bacteria. We also hope to discover how a mother's antibiotic use could influence her baby's growth, development, and immune system. To do this, we will follow mothers and their babies, collecting samples and observing their health over time. This will help us understand the full picture of antibiotic use during breastfeeding.

Who could benefit from this research

Good fit: Ideal candidates are breastfeeding mothers and their infants who may be taking or considering taking commonly prescribed antibiotics.

Not a fit: Patients who are not breastfeeding or whose infants are older than one year may not directly benefit from this particular research.

Why it matters

Potential benefit: If successful, this work could provide clearer guidance for breastfeeding mothers and their doctors regarding antibiotic use, potentially improving infant health outcomes.

How similar studies have performed: While antibiotic use in breastfeeding is common, there is limited comprehensive research specifically on the transmission, milk composition changes, and long-term infant outcomes, making this a novel and important area of inquiry.

Where this research is happening

La Jolla, United States

Researchers

About this research

  1. This is an active NIH-funded research project — typically early-stage science, not a clinical trial accepting patient enrollment.
  2. Some NIH-funded labs run parallel clinical studies or seek volunteers for related work. To check, contact the principal investigator or institution listed above.
  3. For full project details, budget, and progress reports, visit the official NIH RePORTER page below.
Last reviewed 2026-06-13 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.