Tiny Health's story begins with two wildly different births.

Cheryl Sew Hoy had two radically different birth experiences between her children. Her first baby presented breech and was born by C-section. Two years later, her youngest was a vaginal birth with the support of a midwife.

Guess which baby battled eczema and food allergies?

Cheryl’s first baby developed mild eczema and had to work through a sesame allergy after starting solids. This wasn’t a coincidence. Her baby had been exposed to a lot of unfriendly bacteria from the c-section...

And the consequences were showing.

After reading hundreds of scientific papers....

Cheryl found ways to restore her first child’s gut microbiome health, hopefully averting chronic conditions. She tried with:

However, back then gut tests were only available for adults. There was nothing tailored to mom and babies needs. So Cheryl was left without any way of measuring how her baby's microbiome was recovering.

Determined to find answers, Cheryl met a microbiologist who opened her eyes to all the ways you can improve your child's health by deeply understanding their microbiome.

How was this not available to parents? To babies struggling with fussiness, eczema or asthma? That needed to change.

So, Cheryl put together a team of leading scientists, physicians and microbiologists and after a year of working the problem, Tiny Health was born.

“I took charge of my own and my children’s gut health because I knew the microbiome was foundational for lifelong health. What started as a mission for my family has grown into a platform helping almost a hundred thousand families and adults take control of their health.”

Cheryl, Founder of Tiny Health

Introducing the first microbiome tests uniquely designed for families

Vaginal test for mom

Keep your vaginal health in check to ensure you pass friendly bacteria to your baby at birth, and lower risk for pregnancy conditions.

Gut test for mom or dad

Discover if you have the microbes essential for your baby’s immune system and if you are able to pass them on.

Gut test for baby

The first colonizer bacteria can tell if baby had the right start. 3m, 6m, 12m are also important biomarkers to track as their gut rapidly evolves.

Introducing the first microbiome tests uniquely designed for families

0–2 years old

Baby Gut Test

Identify gaps in early microbiome development and immune training

3-18 years old

Child Gut Test (3y–18y)

Track microbiome maturity, diversity and resilience

18+ years old

Adult Gut Test (18+)

Manage chronic conditions, optimize performance, and support longevity goals

18+ years old

Vaginal Health Test

Insights into fertility, pregnancy, menopause, and UTI/yeast imbalance

New clinical study

83% lower odds of eczema risk following Tiny Health intervention

Our groundbreaking study shows babies given personalized microbiome support had 83% lower odds of eczema risk and improved gut health. Published in Pediatric Allergy and Immunology.

“Tiny Health is THE microbiome test that all families should do. Knowledge is Power. And no matter where you are on your health journey, it’s never too late to get your microbiome in order!”

Dr. Elisa Song

Chief Medical Officer at Tiny Health

Stanford-, NYU-, UCSF-trained integrative pediatrician and pediatric functional medicine expert

Built by a team who cares

Who’s on our team: microbiologists, pediatric physicians, science writers, technologists, bioinformaticians, data scientists, wellness experts, lactation consultants, registered dieticians, pediatric acupuncturists, and more. We have 28 babies and kids, 14 cats and 25 dogs, 6 chickens, 208 plants, 1 dragon and 1 hamster. Collectively, we have read 1,587 scientific papers.

Developed with leading scientists, clinicians, and microbiome researchers

Our test is clinically validated for infants, with reference ranges tailored to developing guts, and equally powerful for adults looking to optimize healthspan.

Dr. Elisa Song, MD

Chief Medical Officer

Integrative Pediatrician and Pediatric Functional Medicine Expert

Founder, Healthy Kids Happy Kids

Dr. Emeran Mayer, MD
Medical Advisor
Executive director, G. Oppenheimer Center for Neurobiology of Stress and Resilience, UCLA; Author of The Mind-Gut Connection

Dr Qian Yuan, MD, PhD, FAAP
Medical Advisor
Demarest Lloyd Jr Endowed Chair in Food Allergies;  Senior Pediatrician, Pediatric Gastroenterology and Nutrition, Co-Director of Food Allergy Center, Massachusetts General Hospital; Associate Professor in Pediatrics, Harvard Medical School

Ruben Mars, PhD
Founding Advisor
Ruben Mars is an Assistant Professor of Medicine at Mayo Clinic in Rochester, Minnesota.

Noel Mueller, PhD
Scientific Advisor
Associate Professor of Epidemiology, Johns Hopkins University

Meghan Azad, PhD
Scientific Advisor
Associate Professor of Pediatrics and Child Health at the University of Manitoba; Co-Director, Manitoba Interdisciplinary Lactation Center (MILC); Deputy Director, CHILD Cohort Study

Joel Warsh, MD
Medical Advisor
Board-Certified Pediatrician, Creator of Raising Amazing Podcast

Nicole Calloway Rankins, MD, MPH
Medical Advisor
Medical Advisor; Practicing OB/GYN Hospitalist Physician, Creator and Host of The All About Pregnancy & Birth Podcast

Dr. Kim Green, MD
Medical Advisor
Associate Clinical Professor, UCSF; Pediatrician and former Chief Innovation Officer, Kaiser Permanente

Rodney Dietert, PhD
Scientific Advisor
Professor Emeritus of Microbiology & Immunology, Cornell University

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